L-shaped joint at bottom of combined shell pipe gallery 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 an L-shaped node at the bottom of a combined shell pipe gallery, which is used for overcoming the problems of more joints, poor waterproof effect, heavy components, high transportation cost and poor overall performance existing in the assembly type construction in the background art.
In order to achieve the purpose, the technical scheme adopted by the invention is that the L-shaped node at the bottom of the combined shell and tube gallery comprises a cast-in-place bottom plate and a combined shell side wall plate prefabricated in a factory, and the L-shaped node at the bottom of the combined shell and 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 combined shell side wall plate is composed of a steel reinforcement framework, a counter-pull connecting piece and a high-strength template.
Furthermore, the high-strength formwork of the combined shell side wall plate 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 formwork 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 size of the concrete outer contour of the combined shell side wall plate is consistent with that of a common cast-in-place member.
Further, among the adjacent combination shell piping lane boundary plate, boundary plate distribution reinforcing bar and adjacent boundary plate distribution reinforcing bar adopt overlap joint. The reinforcing bar is distributed to the side wall board in the component manufacturing process, considers adjacent side wall board distribution reinforcing bar position, and side wall board distribution reinforcing bar makes dodges. The high-strength templates of the side wall plate combined shell of the adjacent components are spliced to form side wall plate vertical seams.
Furthermore, in the manufacturing process of the cast-in-place bottom plate, the embedded connecting bars are installed through the positioning steel plates, and in the manufacturing process of the combined shell side wall plate, the stressed steel bars of the side wall plate are arranged in a staggered and close-fitting mode according to the embedded connecting bars.
The construction process of the L-shaped node at the bottom of the combined shell pipe gallery is as follows: s1, casting a bottom plate on the construction site, wherein the cast-in-situ bottom plate comprises cast-in-situ bottom plate stressed steel bars, embedded connecting bars, cast-in-situ bottom plate axillary angle steel bars, cast-in-situ bottom plate distribution steel bars and cast-in-situ concrete. The embedded connecting bars are accurately positioned through the embedded steel bar positioning steel plates and the positioning steel plate preformed holes.
S2 the side wall board of the combined shell and tube gallery is produced in a factory, and the side wall board of the combined shell and tube gallery consists of a side wall board outside combined shell high-strength template 10, a side wall board inside combined shell high-strength template, side wall board distribution steel bars, side wall board stress steel bars and side wall board opposite-pulling connecting pieces. The reinforcing steel bar framework of the side wall plate is formed by the side wall plate distributed reinforcing steel bars, the adjacent side wall plate distributed reinforcing steel bars and the side wall plate stressed reinforcing steel bars. The steel reinforcement framework, the high-strength template of the combined shell on the inner side of the side wall board and the high-strength template of the combined shell on the outer side of the side wall board form a whole through the opposite-pulling connecting pieces of the side wall board.
The side wall board plays the effect of fixed steel reinforcement skeleton to drawing the connecting piece, bears the side pressure that concrete placement process produced to the side wall board simultaneously.
And S3 the embedded connecting bars are positioned through the embedded steel bar positioning steel plates and the positioning steel plate preformed holes.
S4, installing a side wall plate supporting system and hoisting the combined shell and tube gallery side wall plates.
And S5 connecting the stressed reinforcing steel bars of the side wall plate with the embedded connecting bars in an overlapping manner.
S6, installing adjacent combined shell side wall boards, and splicing the adjacent side wall boards to form side wall board vertical seams.
S7, concrete is poured in the side wall plate of the combined shell, and the adjacent cast-in-place bottom plates are connected through the embedded connecting ribs; the connection of the adjacent side wall plate components is completed through the lap joint of the side wall plate component distribution reinforcing steel bars and the adjacent side wall plate component distribution reinforcing steel bars. And finishing the construction of the node structure.
Compared with the prior art, the invention provides the L-shaped node at the bottom of the combined shell pipe gallery, the node adopts cast-in-place concrete to connect the bottom plate and the prefabricated side wall plate, the connecting position has no seam, 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. The side wall board connects the high-strength formwork material and the steel reinforcement framework together through the connecting piece, the standardization degree of the components is high, and the design basis of industrial production is realized.
Drawings
Fig. 1 is an elevation view of an L-shaped node at the bottom of a combined shell-tube lane.
Figure 2 combines shell and tube gallery floors.
Fig. 3a combination shell tube lane edge wall panel.
Fig. 4 shows a combined shell and tube gallery bottom L-shaped node installation process 1.
FIG. 5 is a schematic view of the positioning plate.
Fig. 6 shows a combined shell and tube gallery bottom L-shaped node installation process 2.
FIG. 71-1 is a sectional view.
Fig. 8 is a plan view of an L-shaped node at the bottom of a combined shell and tube lane.
Fig. 9 shows a combined shell and tube gallery bottom L-shaped node installation process 3.
In the figure, 1, a cast-in-place bottom plate; 2. assembling shell side wall boards; 3. a sidewall panel support system; 4. the vertical seam of the side wall plate. 5. Cast-in-place bottom plate stressed steel bars; 6. embedding connecting ribs; 7. pouring in-situ bottom plate axillary angle reinforcing steel bars; 8. distributing steel bars on the cast-in-situ bottom plate; 9. casting concrete in situ; 10. the outer side of the side wall plate is combined with a shell high-strength template; 11. the inner side of the side wall plate is provided with a shell high-strength template; 12a, distributing steel bars on the side wall plates; 12b, distributing steel bars on the adjacent side wall plates; 13. the stressed steel bar of the side wall plate; 14. the side wall plates are oppositely pulled to form connecting pieces; 15. embedding a steel bar positioning steel plate; 16. and positioning the steel plate preformed hole.
Detailed Description
Through comprehensive summary and intensive research on the prior art, the invention mainly solves the following problems:
(1) the L-shaped node at the bottom of the combined shell pipe gallery is characterized in that a bottom plate and a prefabricated side wall plate 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) The side wall board connects the high-strength formwork material and the steel reinforcement framework together through the connecting piece, the standardization degree of the components is high, and the design basis of industrial production is realized.
The main body part of the invention is formed by splicing a cast-in-place bottom plate 1 and a combined shell side wall plate 2 prefabricated in a factory on a construction site to form an L-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 combined shell side wall plate 2 consists of a steel reinforcement framework, a counter-pull connecting piece and a high-strength template.
1. Pipe gallery bottom L type node comprises cast-in-place bottom plate 1 and at prefabricated combination shell side wall board 2 in the mill, forms combination shell pipe gallery bottom L type node at the job site concatenation.
2. The high-strength template of side wall board sets up in the outside of framework of steel reinforcement, occupies cast-in-place structure protective layer's position, and the high-strength template is as the template in concrete placement process, undertakes the lateral pressure of concrete placement in-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 side wall plate is consistent with that of a common cast-in-place member.
3. In adjacent combination shell piping lane boundary plate, boundary plate distribution reinforcing bar 12a adopts overlap joint (direct overlap joint) with adjacent boundary plate distribution reinforcing bar 12 b. The limit wallboard distribution reinforcing bar 12a is in the component manufacturing process, considers adjacent limit wallboard distribution reinforcing bar 12b position, and the reinforcing bar is made dodging. The high-strength templates of the side wall plate combined shell of the adjacent components are spliced to form side wall plate perps 4.
4. In the manufacturing process of the cast-in-place bottom plate 1, the embedded connecting ribs 6 are installed through the positioning steel plates, and in the manufacturing process of the combined shell side wall plate 2, the stressed reinforcing steel bars 13 of the side wall plate are arranged in a staggered and close-fitting mode according to the embedded connecting ribs 6.
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, embedded connecting bars 6, cast-in-place bottom plate axillary angle steel bars 7, cast-in-place bottom plate distribution steel bars 8 and cast-in-place concrete 9. The embedded connecting bars 6 are accurately positioned through the embedded steel bar positioning steel plates 15 and the positioning steel plate preformed holes 16.
(2) As shown in fig. 3: the combined shell and tube gallery side wall plate is produced in a factory, and the combined shell side wall plate 2 consists of a side wall plate outer side combined shell high-strength template 10, a side wall plate inner side combined shell high-strength template 11, side wall plate distribution steel bars 12, side wall plate stress steel bars 13 and side wall plate opposite-pulling connecting pieces 14. The side wall plate distributed reinforcing steel bars 12a, the adjacent side wall plate distributed reinforcing steel bars 12b and the side wall plate stress reinforcing steel bars 13 form a reinforcing steel bar framework of the side wall plate. The steel reinforcement framework, the side wall plate inner side combined shell high-strength template 11 and the side wall plate outer side combined shell high-strength template 10 are integrated through the side wall plate opposite-pulling connecting piece 14.
The wallboard counter-pull connector 14 plays a role of fixing the steel reinforcement framework and bears the side pressure generated by the concrete pouring process to the wallboard.
The thickness of the high-strength template of the combined shell of the inner side wall plate and the outer side wall plate is 2 cm. Because the protective layer of the stressed reinforcing steel bars on the inner side of the side wall board is 3cm, the clear distance between the high-strength template 11 of the combined shell on the inner side of the side wall board and the stressed reinforcing steel bars on the inner side of the side wall board is 1 cm. Because the protective layer of the outside atress reinforcing bar of side wall board is 5cm, the clear distance of side wall board outside combination shell high-strength formwork 10 and the outside atress reinforcing bar of side wall board is 3 cm. This position is controlled by the edge panel pull connector 14.
(3) Fig. 4 and 5: the embedded connecting bars 6 are accurately positioned through the embedded steel bar positioning steel plates 15 and the positioning steel plate preformed holes 16.
(4) FIG. 6: and installing a side wall plate supporting system 3 and hoisting the combined shell and tube gallery side wall plate.
(5) Fig. 7 is a cross section 1-1 of fig. 6, and the stressed steel bars 13 of the side wall plate and the embedded connecting bars 6 are in lap joint.
(6) FIG. 8: and (4) installing adjacent combined shell side wall plates 2, and splicing the adjacent side wall plates to form side wall plate vertical seams 4.
(7) FIG. 9: concrete is poured into the combined shell side wall plate 2, and the adjacent cast-in-place bottom plates are connected through the embedded connecting ribs 6; the connection of the adjacent side wall plate components is completed through the lap joint of the side wall plate component distribution steel bars 13a and the adjacent side wall plate component distribution steel bars 13 b. And finishing the construction of the node structure.