CN114351754A

CN114351754A - Combined shell pipe gallery bottom T-shaped joint and construction method thereof

Info

Publication number: CN114351754A
Application number: CN202111580835.5A
Authority: CN
Inventors: 董磊; 李仁康; 姚爱军
Original assignee: Beijing University of Technology; China Railway Construction Group Co Ltd
Current assignee: Beijing University of Technology; China Railway Construction Group Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-04-15

Abstract

The invention discloses a T-shaped node at the bottom of a combined shell and tube gallery and a construction method thereof. Concrete is poured to complete the construction of the node structure. The composite shell is composed of a steel skeleton of the wall panel, a pair of tensile connectors and a high-strength formwork. The node of the invention uses cast-in-place concrete to connect the bottom plate and the prefabricated mid-wall panel, the connection position has no joints, and the waterproof effect is good; the quality of the combined shell component is only one-fifth of the weight of the full prefabricated component, and the transportation cost of the component is low; the node does not change The concrete section of the cast-in-place member and the connection method of the steel bar are kept consistent with the cast-in-place. The mid-wall panel connects the high-strength formwork material and the steel skeleton through the connector, and the components are highly standardized and have a design basis for industrial production.

Description

Combined shell pipe gallery bottom T-shaped joint and construction method thereof

Technical Field

The invention belongs to the technical field of construction engineering construction, and is mainly used for construction of a pipe gallery structure.

Background

The city of China now enters the golden period of underground space utilization and development, and the construction of urban underground pipe galleries is rapidly developed. At present, a large amount of cast-in-place modes are adopted in the structure construction stage, so that the problems of large wet operation amount of a construction site, large water resource consumption, obvious low industrialization level, low construction efficiency, high overall energy consumption of the industry and the like are caused, and a new construction method is urgently needed to replace the traditional cast-in-place method.

The section form of the pipe gallery is single, which creates conditions for standardized production. But as underground structure, its waterproof requirement is higher, and this also brings certain challenge for the application of assembled piping lane.

The most central part of the assembly construction technology is the node connection between the components. The existing assembled pipe gallery node connection technology has three main problems in general: 1, the assembled member has more joints and poor waterproof effect; 2, the construction cost is higher than that of cast-in-place, and the main reasons are heavy components and high transportation cost. 3, the nodal connection of assembled piping lane adopts modes such as prestressing force, bolt, sleeve more, compares cast-in-place wholeness poor.

Disclosure of Invention

The invention aims to design a T-shaped node at the bottom of a combined shell pipe gallery to solve the problems of more joints, poor waterproof effect, heavy components, high transportation cost and poor overall performance of assembly type construction in the background art.

In order to achieve the purpose, the technical scheme adopted by the invention is that the T-shaped node at the bottom of the combined shell-tube gallery comprises a cast-in-place bottom plate 1 and a combined shell middle wall plate 2 prefabricated in a factory, and the T-shaped node at the bottom of the combined shell-tube gallery is formed by splicing at a construction site; and after splicing, pouring concrete on the construction site to complete the construction of the node structure. The wall plate 2 in the combined shell consists of a steel reinforcement framework, a counter-pull connecting piece and a high-strength template.

Furthermore, the high-strength template of the wall plate in the combined shell is arranged on the outer side of the steel reinforcement framework, occupies the position of the cast-in-place structure protective layer, and serves as a template in the concrete pouring process to bear the lateral pressure in the concrete pouring process. After the concrete pouring is finished, the high-strength template is used as a reinforcing steel bar protection layer to participate in stress.

Further, the concrete outline size of the wall plate in the combined shell is consistent with that of a common cast-in-place member.

Further, among the adjacent combination shell piping lane well wallboard, well wallboard distribution reinforcing bar 9a adopts overlap joint with adjacent well wallboard distribution reinforcing bar 9 b. Well wallboard distribution reinforcing bar 9a considers the position of adjacent well wallboard distribution reinforcing bar 9b in the component manufacturing process, and well wallboard distribution reinforcing bar 9a makes dodges. The middle wallboard combination shell high-strength templates of the adjacent components are spliced to form a middle wallboard vertical joint 4.

Furthermore, in the manufacturing process of the cast-in-place bottom plate, the embedded connecting ribs 7 are arranged through the positioning steel plates, and in the manufacturing process of the combined shell middle wall plate 2, the stressed reinforcing steel bars 10 of the middle wall plate are arranged in a staggered and close-fitting mode according to the embedded connecting ribs 7.

The T-shaped node specific implementation mode at the bottom of the combined shell pipe rack is as follows: s1, casting a bottom plate on the construction site, wherein the cast-in-place bottom plate 1 is composed of cast-in-place bottom plate stressed steel bars 5, cast-in-place bottom plate distribution steel bars 6, embedded connecting bars 7 and cast-in-place concrete 8. The embedded connecting bars 7 are accurately positioned through the embedded steel bar positioning steel plates 13 and the positioning steel plate preformed holes 14.

S2 the combined shell and tube gallery middle wall plate is produced in the factory, the combined shell middle wall plate 2 is composed of middle wall plate distribution reinforcing steel bars 9a, adjacent middle wall plate distribution reinforcing steel bars 9b, middle wall plate stress reinforcing steel bars 10, a middle wall plate combined shell high-strength template 11 and a middle wall plate opposite-pulling connecting piece 12. The position is controlled by the middle wall plate opposite pulling connecting piece. In the wallboard manufacturing process in the combination shell, the stressed steel bars 10 of the middle wallboard are avoided according to the embedded connecting bars 7.

S3 the embedded connecting bars 7 are accurately positioned through the embedded steel bar positioning steel plates 13 and the positioning steel plate preformed holes 14.

S4, installing the middle wallboard support system 3 and hoisting the middle wallboard of the combined shell and tube gallery.

And S5, connecting the stressed reinforcing steel bars 10 of the wallboard with the embedded connecting bars 7 in an overlapping manner.

S6, installing the middle wall boards of the adjacent combined shell and tube gallery, and splicing the adjacent middle wall boards to form a middle wall board vertical joint 4.

S7, concrete is poured in the middle wall plate 2 of the combined shell, and the middle wall plate embedded connecting ribs 7 are connected with the cast-in-place bottom plate 1; the connection of the adjacent middle wall boards is completed through the lap joint of the middle wall board distribution steel bars 9a and the adjacent middle wall board distribution steel bars 9 b. And finishing the construction of the T-shaped node structure at the bottom of the combined shell and tube gallery.

Compared with the prior art, the invention provides the T-shaped node at the bottom of the combined shell pipe gallery, the bottom plate and the prefabricated middle wall plate are connected by adopting cast-in-place concrete, the connecting position is seamless, and the waterproof effect is good; the mass of the combined shell component is only one fifth of the weight of the whole prefabricated component, and the transportation cost of the component is low; the concrete section and the steel bar connection mode of the cast-in-place member are not changed by the node, and the integrity is kept consistent with the cast-in-place property. Well wallboard passes through the connecting piece and links together high-strength template material and framework of steel reinforcement, and the standardized degree of component is high, has industrial production's design basis.

Drawings

Fig. 1 is a T-shaped node elevation view of the bottom of a combined shell and tube lane.

Figure 2 combines shell and tube gallery floors.

Fig. 3 composite shell tube lane center wall panel.

Fig. 4 shows a T-shaped node installation process 1 at the bottom of a combined shell and tube gallery.

FIG. 5 is a schematic view of the positioning plate.

Fig. 6 shows a combined shell and tube gallery bottom T-shaped node installation process 2.

FIG. 71-1 is a sectional view.

Fig. 8 is a plan view of a T-shaped node at the bottom of a combined shell and tube lane.

Fig. 9 shows a combined shell and tube gallery bottom T-shaped node installation process 3.

In the figure: 1. casting a bottom plate in situ; 2. a composite shell-in-shell wall panel; 3. a middle wallboard support system; 4. vertical seams of the middle wall plate; 5. cast-in-place bottom plate stressed steel bars; 6. distributing steel bars on the cast-in-situ bottom plate; 7. embedding connecting ribs; 8. casting concrete in situ; 9a, distributing steel bars on the middle wall plate; 9b, distributing steel bars on the adjacent middle wallboards; 10. the middle wallboard is stressed with steel bars; 11. a middle wallboard combined shell high-strength template; 12. the middle wallboard is a split connecting piece; 13. embedding a steel bar positioning steel plate; 14. and positioning the steel plate preformed hole.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Through comprehensive summary and intensive research on the prior art, the invention mainly solves the following problems:

(1) the T-shaped node at the bottom of the combined shell pipe gallery is characterized in that a bottom plate and a prefabricated middle wallboard are connected by cast-in-place concrete, the connecting position is seamless, and the waterproof effect is good;

(2) the mass of the combined shell component is only one fifth of the weight of the whole prefabricated component, and the transportation cost of the component is low;

(3) the concrete section and the steel bar connection mode of the cast-in-place member are not changed by the node, and the integrity is kept consistent with the cast-in-place property.

(4) Well wallboard passes through the connecting piece and links together high-strength template material and framework of steel reinforcement, and the standardized degree of component is high, has industrial production's design basis.

The main body part of the invention is formed by splicing a cast-in-place bottom plate 1 and a combined shell middle wall plate 2 prefabricated in a factory on a construction site to form a T-shaped node at the bottom of a combined shell pipe gallery. And after splicing, pouring concrete on the construction site to complete the construction of the node structure. The wall plate 2 in the combined shell consists of a steel reinforcement framework, a counter-pull connecting piece and a high-strength template.

1. Pipe gallery bottom T type node comprises cast-in-place bottom plate 1 and wallboard 2 in the prefabricated combination shell in mill, forms combination shell pipe gallery bottom T type node at the job site concatenation.

2. The high-strength template of the middle wallboard is arranged on the outer side of the steel reinforcement framework, occupies the position of the cast-in-place structure protective layer, and serves as a template in the concrete pouring process to bear the lateral pressure in the concrete pouring process. After the concrete pouring is finished, the high-strength template is used as a reinforcing steel bar protection layer to participate in stress. The concrete outline size of the middle wall plate is consistent with that of a common cast-in-place member.

3. In the wallboard in adjacent combination shell piping lane, well wallboard distribution reinforcing bar 9a adopts overlap joint (direct overlap joint) with adjacent well wallboard distribution reinforcing bar 9 b. Well wallboard distribution reinforcing bar 9a considers the position of adjacent well wallboard distribution reinforcing bar 9b in the component manufacturing process, and the reinforcing bar is made dodges. The middle wallboard combination shell high-strength templates of the adjacent components are spliced to form a middle wallboard vertical joint 4.

4. In the manufacturing process of the cast-in-place bottom plate, the embedded connecting ribs 7 are arranged through the positioning steel plates, and in the manufacturing process of the combined shell middle wall plate 2, the stressed reinforcing steel bars 10 of the middle wall plate are arranged in a staggered and close-fitting mode according to the embedded connecting ribs 7.

5. Construction process

(1) As shown in fig. 2: and (3) pouring a bottom plate on the construction site, wherein the cast-in-place bottom plate 1 consists of cast-in-place bottom plate stressed steel bars 5, cast-in-place bottom plate distribution steel bars 6, pre-embedded connecting bars 7 and cast-in-place concrete 8. The embedded connecting bars 7 are accurately positioned through the embedded steel bar positioning steel plates 13 and the positioning steel plate preformed holes 14.

(2) As shown in fig. 3: the combined shell and tube gallery middle wall plate is produced in a factory, and the combined shell middle wall plate 2 consists of middle wall plate distribution reinforcing steel bars 9a, adjacent middle wall plate distribution reinforcing steel bars 9b, middle wall plate stress reinforcing steel bars 10, a middle wall plate combined shell high-strength template 11 and a middle wall plate counter-pull connecting piece 12. The middle wallboard combination shell high-strength template 11 is 2cm thick. Because the protective layer of the stressed reinforcing steel bar of the middle wallboard is 3cm, the clear distance between the high-strength template of the combined shell of the middle wallboard and the stressed reinforcing steel bar of the middle wallboard is 1 cm. The position is controlled by the middle wall plate opposite pulling connecting piece. In the wallboard manufacturing process in the combination shell, the stressed steel bars 10 of the middle wallboard are avoided according to the embedded connecting bars 7.

(3) Fig. 4 and 5: the embedded connecting bars 7 are accurately positioned through the embedded steel bar positioning steel plates 13 and the positioning steel plate preformed holes 14.

(4) FIG. 6: and installing a middle wallboard supporting system 3 and hoisting the middle wallboard of the combined shell and tube gallery.

(5) Fig. 7 is a section 1-1 of fig. 6, wherein the stressed steel bars 10 of the middle wall board and the embedded connecting bars 7 are in lap joint.

(6) FIG. 8: and installing the middle wallboards of the adjacent combined shell and tube galleries, and splicing the adjacent middle wallboards to form a middle wallboard vertical joint 4.

(7) FIG. 9: concrete is poured into the middle wall plate 2 of the combined shell, and the middle wall plate embedded connecting ribs 7 are connected with the cast-in-place bottom plate 1; the connection of the adjacent middle wall boards is completed through the lap joint of the middle wall board distribution steel bars 9a and the adjacent middle wall board distribution steel bars 9 b. And finishing the construction of the node structure.

Claims

1. T-type node at the bottom of the combined shell and tube gallery, it is characterized in that: comprising a cast-in-place bottom plate and a composite shell mid-wall panel prefabricated in the factory, and splicing at the construction site to form a T-type node at the bottom of the combined shell and tube gallery; after the splicing is completed, at the construction site Concrete is poured to complete the construction of the joint structure; the wall panel in the composite shell is composed of a steel skeleton, a pair of tensile connectors and a high-strength formwork.

2. The T-joint at the bottom of the combined shell and tube gallery according to claim 1, is characterized in that: the high-strength formwork of the wall panel in the combined shell is arranged on the outside of the steel skeleton, occupying the position of the cast-in-place structural protection layer, and in the concrete pouring process The medium and high-strength formwork is used as the formwork to bear the lateral pressure during the concrete pouring process; after the concrete pouring is completed, the high-strength formwork acts as the reinforcement layer and participates in the stress.

3. The T-joint at the bottom of the combined shell and tube gallery according to claim 1, characterized in that: the size of the concrete outer contour of the wall panel in the combined shell is consistent with that of ordinary cast-in-place components.

4. The T-shaped node at the bottom of the combined shell and tube gallery according to claim 1, is characterized in that: in the adjacent composite shell and tube gallery middle wall panels, the distribution steel bars of the middle wall panels and the adjacent middle wall panel distribution steel bars adopt lap joints Connection; the distribution of steel bars in the middle wall panel In the process of component production, the distribution of steel bars on the adjacent middle wall panels is considered, and the distribution of steel bars on the middle wall panels is avoided; .

5. The T-shaped node at the bottom of the combined shell and tube gallery according to claim 1, characterized in that: in the process of making the cast-in-place bottom plate, pre-embedded connecting ribs are installed by positioning steel plates, and in the process of making the middle wall panel of the combined shell, the The plate bearing steel bars are arranged in dislocation and close contact according to the pre-embedded connecting bars.

6. The T-type node at the bottom of the combined shell and tube gallery according to any one of claims 1-5, is characterized in that: the specific implementation of the T-type node at the bottom of the combined shell and tube gallery is as follows: S1 is to cast the bottom plate at the construction site, and the cast-in-place bottom plate It is composed of cast-in-place base plate stressed steel bars, cast-in-place base plate distribution steel bars, pre-embedded connecting bars, and cast-in-place concrete; the pre-embedded connecting bars are accurately positioned through the pre-embedded steel bars to locate the steel plate and the reserved holes for the positioning steel plate;

S2 produces the composite shell and tube gallery mid-wall panels in the factory. The composite shell mid-wall panels are composed of the distribution steel bars of the mid-wall panels, the distribution steel bars of the adjacent mid-wall panels, the stress-bearing steel bars of the mid-wall panels, the high-strength formwork of the mid-wall panel composite shell, and the mid-wall panels. It is composed of tension connectors; the position is controlled by the tension connectors of the mid-wall panel; during the production process of the mid-wall panel of the composite shell, the reinforcement bars of the mid-wall panel are avoided according to the embedded connection bars;

S3 pre-embedded connecting bars are accurately positioned by pre-embedded steel bars for positioning steel plates and reserved holes for positioning steel plates;

S4 install the mid-wall panel support system, and hoist the mid-wall panel of the combined shell and tube gallery;

S5 medium wall panel stress steel bar and pre-embedded connecting bar lap connection;

S6 install the adjacent combined shell and tube gallery mid-wall panels, and the adjacent mid-wall panels are spliced to form vertical joints of the mid-wall panels;

S7: Concrete is poured in the middle wall panel of the composite shell, and the cast-in-place bottom plate is connected by the pre-embedded connecting bars of the middle wall panel; the connection between the adjacent middle wall panels is completed by the overlapping of the distribution steel bars of the middle wall panel and the distribution steel bars of the adjacent middle wall panels. ; The construction of the T-joint structure at the bottom of the combined shell and tube gallery is completed.