PEC composite structure and construction method of fully assembled underground pipe gallery and underground space

Abstract

A fully assembled underground pipe gallery and underground space co-construct a PEC composite structure and construction method, wherein the PEC composite structure includes a bottom pipe gallery, soil-facing side walls, a middle plate, a top plate, and a PEC beam; the bottom pipe gallery is assembled from multiple reinforced concrete pipe gallery prefabricated blocks, and the soil-facing side walls are assembled from multiple composite side wall panels, which include reinforced concrete slabs and H-shaped steel columns. The bottom of the H-shaped steel column is connected to the pre-buried channel steel connector on the top surface of the reinforced concrete pipe gallery prefabricated block, and a PEC beam is rigidly connected between the tops of each two H-shaped steel columns on the same side; the middle plate is assembled from multiple composite middle plates, and the top plate is assembled from multiple composite top plates, both of which include reinforced concrete slabs and steel beams, and the steel beams are strongly connected to the short beam joints on the H-shaped steel columns. Compared with general fully prefabricated assembled concrete structural components, the present invention has made significant progress in design, construction, operation and maintenance, and has significant social benefits, economic and environmental benefits, and promotion value.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal engineering, relates to underground structures, and specifically relates to a fully assembled underground pipe gallery and underground space co-constructed PEC combined structure. Background Art

[0002] At present, urban underground space development mostly adopts a development model of concentrated construction of underground space in the central area and independent construction of underground space in the periphery. Within the red line, there are multiple municipal and transportation facilities on the same line, with vertically stacked structures and horizontal interconnection of underground spaces. The use of a co-construction structure can realize the integrated construction of co-line facilities, share the foundation, concentrate space, improve construction efficiency, and reserve conditions for unmanned logistics and sanitation.

[0003] Currently, prefabricated underground structures are primarily reinforced concrete structures, using fully prefabricated assembly connections or composite structures. Composite structures have a low prefabrication rate and tend to use more post-cast concrete. They offer limited advantages in terms of construction, construction period, cost, and environmental impact. Prefabricated reinforced concrete components are generally large and heavy, resulting in high transportation costs or even difficulty in transportation. On-site hoisting processes are complex and require high equipment requirements. The stress variations between different sections of the same component vary significantly. Transverse joints cut off the connection between the main load-bearing components, and the stress on the main structure requires consideration of the connection structure and the impact of the connection location on the overall stiffness. Parameter acquisition through experimental and simulation calculations is costly, design calculations are complex, and accuracy is low. Waterproofing performance is also affected by the stress characteristics of the main structure. Therefore, research on new fully prefabricated underground structural systems that are lightweight, compact, low in transportation costs, and easy to construct and install is an important direction for the future development of underground engineering. Summary of the Invention

[0004] In response to the above problems, the present invention provides a fully assembled underground pipe gallery and underground space co-constructed PEC combined structure.

[0005] The purpose of the present invention can be achieved by the following technical solutions: a fully assembled underground pipe gallery and underground space co-construct a PEC composite structure, including a bottom pipe gallery, a soil-facing side wall, a middle plate, a top plate, and a PEC beam; the bottom pipe gallery is assembled by a plurality of reinforced concrete pipe gallery prefabricated blocks, and two adjacent reinforced concrete pipe gallery prefabricated blocks are connected by longitudinal joints, and the top surfaces of the reinforced concrete pipe gallery prefabricated blocks are provided with channel steel connectors; the soil-facing side wall is assembled by a plurality of combined side wall panels, and the combined side wall panels include reinforced concrete panels and steel panels fixed to the steel panels by shear bolts. An H-shaped steel column on a reinforced concrete slab is provided with a short beam joint for installing a middle plate and a top plate. The bottom of the H-shaped steel column is connected to the channel steel connector on the top surface of the reinforced concrete pipe gallery prefabricated block. A PEC beam is rigidly connected between the tops of two H-shaped steel columns spaced apart on the same side. The middle plate is spliced ​​by multiple combined middle plates, and the top plate is spliced ​​by multiple combined top plates. The combined middle plate and the combined top plate both include reinforced concrete slabs and steel beams fixed to the reinforced concrete slabs by shear bolts. The steel beams are connected to the short beam joints on the H-shaped steel column with equal strength.

[0006] Furthermore, the longitudinal joints between the prefabricated blocks of the reinforced concrete pipe gallery include mortise and tenon joints and prestressed precision-rolled threaded steel bars.

[0007] Furthermore, a waterproof sealing gasket is provided on the longitudinal joint.

[0008] Furthermore, a gusset plate is welded to each of two adjacent H-shaped steel columns on the same side of the combined side wall panel to form a lattice steel column.

[0009] Furthermore, fine stone concrete is poured on the H-shaped steel columns of the composite side wall panels to form PEC composite columns.

[0010] A construction method for the above-mentioned fully assembled underground pipe gallery and underground space co-constructing a PEC combined structure includes the following steps:

[0011] (1) Construct an outer underground continuous wall to reduce water in the pit;

[0012] (2) Excavate the foundation pit to the bottom, apply the cushion layer, paving the bottom, and applying the waterproof layer;

[0013] (3) Position and hoist the reinforced concrete pipe gallery prefabricated blocks, and use longitudinal joints to connect two adjacent reinforced concrete pipe gallery prefabricated blocks;

[0014] (4) Position and hoist the combined side wall panels on both sides so that the H-shaped steel columns of the combined side wall panels are bolted and welded to the pre-buried channel steel connectors on the corresponding sides of the reinforced concrete pipe gallery prefabricated blocks;

[0015] (5) Hoist the PEC beam so that its two ends are rigidly connected to the two H-shaped steel columns spaced apart from each other on the same side of the composite side wall panel;

[0016] (6) Hoist the composite middle plate to ensure a strong connection between the steel beam of the composite middle plate and the short beam joints on the H-shaped steel columns of the composite side wall panels;

[0017] (7) Hoist the composite top plate to ensure a strong connection between the steel beams of the composite top plate and the short beam joints on the H-shaped steel columns of the composite side wall panels;

[0018] (8) Weld the tie plates on the two adjacent H-shaped steel columns of the composite side wall panel, and pour fine stone concrete on the two H-shaped steel columns to form a PEC composite column;

[0019] (9) Local prestressing of each joint.

[0020] Compared with the existing technology, the present invention has the advantages of general prefabricated structures, which can be mass-produced, have uniform quality, short construction period, high construction precision, low construction cost, controllable quality, less noise and environmental pollution, less use of on-site construction templates, and less waste of on-site building materials. In addition, compared with general fully prefabricated assembled concrete structural components, it has the following advantages: in terms of design, the separation of joint force and main body force is achieved, the force transmission path is clearer, and the structural calculation and analysis is more accurate; in terms of construction, the components are small and light, the complexity of construction equipment and installation is reduced, and the construction site node processing is more convenient, which can further shorten the construction period, reduce the construction difficulty, and improve the quality of the project. It has very significant effects in energy saving, water saving, and material saving, and can greatly reduce construction waste and construction dust, which is more conducive to environmental protection; in terms of operation and maintenance, since the structural force system is clear, it is conducive to the layout, implementation, maintenance and diagnosis of structural health monitoring throughout the life cycle, and is also conducive to structural strengthening and reinforcement design after reaching the design service life, extending the service life and service life. Therefore, in the long run, this structural system has significant social benefits, economic and environmental benefits and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the reinforced concrete pipe gallery prefabricated block in the present invention;

[0023] Figure 3 Schematic diagram of the structure of the short combined side wall panel in the present invention;

[0024] Figure 4 Schematic diagram of the structure of the long combined side wall panel in the present invention;

[0025] Figure 5 Schematic cross-sectional view of the PEC composite column of the present invention;

[0026] Figure 6Schematic diagram of the structure of the combined middle plate in the present invention;

[0027] Figure 7 Schematic diagram of the structure of the combined top plate of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the PEC beam in the present invention;

[0029] Figure 9 Schematic cross-sectional view of two PEC composite columns and their upper plates in the present invention;

[0030] Figure 10 This is a schematic diagram of step (3) during the construction of the present invention;

[0031] Figure 11 A schematic diagram of step (4) during the construction of the present invention;

[0032] Figure 12 A schematic diagram of step (4) during the construction of the present invention;

[0033] Figure 13 A schematic diagram of step (4) during the construction of the present invention;

[0034] Figure 14 This is a schematic diagram of step (5) during the construction of the present invention;

[0035] Figure 15 This is a schematic diagram of step (6) during the construction of the present invention;

[0036] Figure 16 This is a schematic diagram of step (7) during the construction of the present invention.

[0037] The reference numerals are as follows:

[0038] 1Reinforced concrete pipe gallery prefabricated blocks

[0039] 2 short combined side wall panels

[0040] 3 long combined side wall panels

[0041] 4 combined middle plate

[0042] 5Combination top plate

[0043] 6PEC beam

[0044] 7H steel column

[0045] 8 channel steel connectors

[0046] 9 Short beam joint

[0047] 10 gusset plates

[0048] 11 Fine stone concrete

[0049] 12 structural steel bars

[0050] 13PEC composite column. DETAILED DESCRIPTION

[0051] The following describes the specific embodiments of the present invention in detail in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative, rather than limiting, the scope of the present invention.

[0052] See also Figure 1 A fully assembled underground pipe gallery and underground space co-construct a PEC combined structure, including a bottom pipe gallery, side walls facing the soil, a middle plate, a top plate, and a PEC beam 6.

[0053] The bottom pipe gallery is the lowest structure and is used to meet the laying requirements of various pipelines. Figure 2 The bottom tunnel is assembled from a number of reinforced concrete tunnel prefabricated blocks 1. Each reinforced concrete tunnel prefabricated block 1 is a transverse full-section prefabricated reinforced concrete component. Two adjacent reinforced concrete tunnel prefabricated blocks 1 are connected by longitudinal joints. The longitudinal joints include mortise and tenon joints and prestressed precision-rolled threaded steel bars. Waterproof sealing gaskets can be provided on the longitudinal joints. Combined with local prestressing, waterproofing can be achieved without considering the influence of the main structure on the stress. A channel steel connector 8 is provided on the top surface of the reinforced concrete tunnel prefabricated block 1, which is used to connect the H-shaped steel column 7 of the combined side wall panel.

[0054] The side wall facing the soil is used to bear the pressure of the soil surface, and the side wall facing the soil is composed of multiple combined side wall panels. Figure 1 and Figure 3 The figure shows the soil-facing side wall on the middle layer side, which is composed of multiple short combined side wall panels 2, with the first short combined side wall panel, the second short combined side wall panel, and the third short combined side wall panel forming a unit; Figure 1 and Figure 4 The figure shows the soil-facing side wall on the other side of the top and middle floors. It is composed of multiple long composite side wall panels 3, with the first, second, and third long composite side wall panels forming a unit. Each composite side wall panel uses an H-shaped steel column 7 and reinforced concrete slab structure, including the reinforced concrete slab and the H-shaped steel column 7 fixed to the reinforced concrete slab with shear studs. The H-shaped steel column 7 is equipped with short beam joints 9 for mounting the middle and top panels. Figure 5The bottom of the H-shaped steel column 7 is connected to the channel steel connector 8 on the top surface of the reinforced concrete pipe gallery precast block 1. The H-shaped steel column 7 is used to bear vertical loads. After the H-shaped steel column 7 is connected to the channel steel connector 8, fine stone concrete 11 can be poured into the cavity between the flange and web of the H-shaped steel column 7, and structural steel bars 12 can be optionally configured to form a PEC composite column. The PEC composite column strengthens the waterproofing and compressive bearing capacity of the vertical joints of the composite side wall panels. At the same time, the local buckling of the open section improves the bending and torsional stiffness and overall stability of the entire section. It also reduces the need for fire and corrosion prevention measures on the surface of the original H-shaped steel column, making it more economical and practical, and improving durability.

[0055] The middle plate is made up of multiple combined middle plates 4. Figure 6 The middle plates shown in the figure are composed of the first, second, and third composite middle plates, forming a middle plate unit. Each composite middle plate 4 is a composite structure of steel beams and reinforced concrete, comprising a reinforced concrete slab and a steel beam secured to the slab via shear studs. The steel beams are connected to the short beam joints 9 on the H-shaped steel columns 7 using equal strength connections.

[0056] The top plate is made up of multiple combined top plates 5. Figure 7 The roof panels shown in the figure are composed of a first composite roof panel, a second composite roof panel, and a third composite roof panel. Each composite roof panel 5 is constructed using a steel beam and reinforced concrete composite structure, comprising a reinforced concrete slab and a steel beam secured to the slab via shear studs. The steel beams are connected to the short beam joints 9 on the H-shaped steel columns 7 using equal strength connections.

[0057] See also Figure 1 and Figure 8 The two ends of the PEC beam 6 are rigidly connected to the top of two H-shaped steel columns 7 spaced apart on the same side. The use of PEC beam 6 as the top-level large-span beam improves the torsional and bending rigidity and bearing capacity. After the PEC beam 6 is connected to the two H-shaped steel columns 7, see Figure 9 Two adjacent H-shaped steel columns 7 can be connected by welding plates 10 to form a lattice steel column, and then fine stone concrete is poured inside to form a PEC composite column 13, thereby forming a combined structure of PEC beams and PEC composite columns, which greatly improves the overall deformation and stress.

[0058] A construction method for a fully assembled underground pipe gallery and underground space co-constructing a PEC combined structure includes the following steps:

[0059] (1) Build a fence, level the site, divert traffic, construct an outer underground continuous wall, and dewater the pit.

[0060] (2) Excavate the foundation pit to the bottom, apply the cushion layer, paving the bottom, and applying the waterproof layer.

[0061] (3) See Figure 10, locate and hoist the reinforced concrete pipe gallery prefabricated block 1, and use a longitudinal joint to connect two adjacent reinforced concrete pipe gallery prefabricated blocks 1.

[0062] (4) See Figure 11 First, locate and hoist the first short combined side wall panel and the second long combined side wall panel, so that the H-shaped steel column 7 of each combined side wall panel is bolted and welded to the corresponding side channel steel connector 8 on the reinforced concrete pipe gallery prefabricated block 1; see Figure 12 , then locate and hoist the second short combined side wall panel and the second long combined side wall panel, so that the H-shaped steel column 7 of each combined side wall panel is bolted and welded to the corresponding side channel steel connector 8 on the reinforced concrete pipe gallery prefabricated block 1; see Figure 13 Then, locate and hoist the third short combined side wall panel and the third long combined side wall panel, so that the H-shaped steel column 7 of each combined side wall panel is bolted and welded to the channel steel connector 8 on the corresponding side of the reinforced concrete pipe gallery prefabricated block 1.

[0063] (5) See Figure 14 , hoist the PEC beam 6 so that its two ends are rigidly connected to the top ends of two spaced H-shaped steel columns 7 of the combined side wall panel on the same side.

[0064] (6) See Figure 15 , hoist the first combined middle plate, the second combined middle plate, and the third combined middle plate, so that the steel beam of each combined middle plate 4 is strongly connected with the short beam joint 9 on the H-shaped steel column 7 of the combined side wall plate.

[0065] (7) See Figure 16 , hoist the first combined top plate, the second combined top plate, and the third combined top plate, so that the steel beams of each combined top plate 5 are strongly connected with the short beam joints 9 on the H-shaped steel columns 7 of the combined side wall panels.

[0066] (8) Weld the tie plate 10 onto the two adjacent H-shaped steel columns 7 of the composite side wall panel, and pour fine stone concrete on the two H-shaped steel columns 7 to form a PEC composite column.

[0067] (9) Local prestressing of each joint.

[0068] At this point, the assembly of one unit is completed. The next step is to repeat the above steps (3) to (9) to complete the assembly of other units until the construction of the entire PEC composite structure is completed.

[0069] It should be noted that the present invention, having been fully described, is susceptible to numerous variations and modifications, and is not limited to the specific embodiments described above. The foregoing embodiments are intended to illustrate the present invention, not to limit it. In short, the scope of protection of the present invention encompasses any such variations, substitutions, and modifications as would be apparent to one of ordinary skill in the art.

Claims

1. A fully assembled underground pipe gallery and underground space co-constructed PEC combined structure, characterized in that: Including the bottom pipe gallery, soil-facing side walls, middle plate, top plate, and PEC beams; The bottom pipe gallery is assembled from a plurality of reinforced concrete pipe gallery prefabricated blocks, and two adjacent reinforced concrete pipe gallery prefabricated blocks are connected by longitudinal joints. The top surfaces of the reinforced concrete pipe gallery prefabricated blocks are provided with channel steel connectors, and the longitudinal joints are provided with waterproof sealing pads; The soil-facing side wall is composed of multiple composite side wall panels, each of which includes a reinforced concrete slab and an H-shaped steel column fixed to the reinforced concrete slab by shear studs. The H-shaped steel column is provided with a short beam joint for installing the middle plate and the top plate. The bottom of the H-shaped steel column is connected to the channel steel connector on the top surface of the reinforced concrete pipe gallery prefabricated block. A PEC beam is rigidly connected between the tops of the two H-shaped steel columns spaced apart on the same side. A gusset plate is welded to the two adjacent H-shaped steel columns on the same side of the composite side wall panel to form a lattice steel column. The middle plate is spliced ​​by multiple combined middle plates, and the top plate is spliced ​​by multiple combined top plates. The combined middle plate and the combined top plate both include reinforced concrete plates and steel beams fixed to the reinforced concrete plates by shear bolts. The steel beams are connected to the short beam joints on the H-shaped steel columns with equal strength.

2. The fully assembled underground pipe gallery and underground space co-constructed PEC combined structure according to claim 1 is characterized in that: The longitudinal joints between the prefabricated blocks of the reinforced concrete pipe gallery include mortise and tenon joints and prestressed precision-rolled threaded steel bars.

3. The fully assembled underground pipe gallery and underground space co-constructed PEC combined structure according to claim 1 is characterized in that: Fine stone concrete is poured on the H-shaped steel columns of the composite side wall panels to form PEC composite columns.

4. A construction method for a fully assembled underground pipe gallery and underground space co-constructing a PEC combined structure as described in any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Construct an outer underground continuous wall to reduce water in the pit; (2) Excavate the foundation pit to the bottom, apply the cushion layer, paving the bottom, and applying the waterproof layer; (3) Position and hoist the reinforced concrete pipe gallery prefabricated blocks, and use longitudinal joints to connect two adjacent reinforced concrete pipe gallery prefabricated blocks; (4) Position and hoist the combined side wall panels on both sides so that the H-shaped steel columns of the combined side wall panels are bolted and welded to the pre-buried channel steel connectors on the corresponding sides of the reinforced concrete pipe gallery prefabricated blocks; (5) Hoist the PEC beam so that its two ends are rigidly connected to the two H-shaped steel columns spaced apart from each other on the same side of the composite side wall panel; (6) Hoist the composite middle plate to ensure a strong connection between the steel beam of the composite middle plate and the short beam joints on the H-shaped steel columns of the composite side wall panels; (7) Hoist the composite top plate to ensure a strong connection between the steel beams of the composite top plate and the short beam joints on the H-shaped steel columns of the composite side wall panels; (8) Weld the tie plates on the two adjacent H-shaped steel columns of the composite side wall panel, and pour fine stone concrete on the two H-shaped steel columns to form a PEC composite column; (9) Local prestressing of each joint.

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