Concrete plugging structure of subway shield rectangular vertical shaft

Abstract

The utility model discloses a concrete blocking structure of a subway shield rectangular vertical shaft, which comprises a plurality of prefabricated UHPC (Ultra High Performance Concrete) blocking plates, two ends of each prefabricated UHPC blocking plate are placed on a step surface of a top frame of the subway shield rectangular vertical shaft, and two adjacent prefabricated UHPC blocking plates are propped against each other; cast-in-place reinforced concrete is arranged at the tops of the multiple prefabricated UHPC plugging plates, and the periphery of the cast-in-place reinforced concrete and the inner wall of a frame at the top of the subway shield rectangular vertical shaft are fixed and sealed; a reinforcing mesh is arranged in each prefabricated UHPC groove type plugging plate in the length direction and the width direction. The prefabricated UHPC blocking plates are all prefabricated UHPC groove-shaped blocking plates, an opening of a groove of each prefabricated UHPC groove-shaped blocking plate faces upwards, and the cross section of each prefabricated UHPC groove-shaped blocking plate is in an E shape. According to the concrete blocking structure of the subway shield rectangular vertical shaft, the blocking concrete quality can meet the design strength requirement, scaffolds do not need to be erected from bottom to top, the engineering amount is small, the construction period is short, the construction cost is low, and the construction efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of subway construction, in particular to a concrete blocking structure for a subway shield rectangular shaft. Background Art

[0002] The rectangular shaft of the subway shield is an indispensable construction channel in subway construction. The height from bottom to top is generally about 20 meters. The top of the subway shield shaft is generally reserved with steps to bear the weight of the permanent sealing concrete structure. After the subway construction is completed, its top needs to be permanently sealed with concrete.

[0003] In existing technology, permanent concrete sealing of rectangular shafts in subway shield tunnels is a complex undertaking. This involves erecting a full-height scaffolding structure from the bottom of the shaft upwards, installing formwork, and then pouring reinforced concrete on the ground. Once the concrete reaches the desired strength, the full-height scaffolding structure is dismantled within the shaft. The dismantled scaffolding is then transported through the subway tunnel to the permanent exit and then lifted to the ground. This large-scale undertaking results in a long construction period, high material, equipment, and labor costs, and low efficiency. This technical problem has yet to be effectively addressed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a concrete blocking structure for a subway shield rectangular shaft, the blocking concrete quality of which can meet the design strength requirements and does not require scaffolding from the bottom up.

[0005] The technical solution of the utility model is to provide a concrete blocking structure for a rectangular shaft of a subway shield, comprising a plurality of prefabricated UHPC blocking panels with both ends resting on the stepped surfaces of the top frame of the rectangular shaft of the subway shield, with two adjacent prefabricated UHPC blocking panels abutting against each other; cast-in-place reinforced concrete is provided on the top of the plurality of prefabricated UHPC blocking panels, and the four sides of the cast-in-place reinforced concrete are fixed and sealed to the inner wall of the top frame of the rectangular shaft of the subway shield.

[0006] After adopting the above structure, the concrete sealing structure for the subway shield rectangular shaft of the utility model has the following advantages: because multiple prefabricated UHPC sealing plates are placed at both ends on the stepped surface at the top of the subway shield rectangular shaft, the ultra-high strength mechanical properties, ultra-high toughness, high density, corrosion resistance, impact resistance, and compressive strength of UHPC (ultra-high performance concrete) are fully utilized. The sealing concrete quality in the concrete sealing structure can fully meet the design strength requirements, and no formwork is required, no scaffolding needs to be erected from the bottom of the subway shield rectangular shaft to a height of approximately 20 meters, and no scaffolding needs to be dismantled afterwards or the dismantled scaffolding materials need to be transported and hoisted. The entire sealing process can be carried out only on the ground. The engineering work is significantly shortened, the construction period is shortened, and the construction material, equipment, and labor costs are all significantly reduced, that is, the construction cost is low and the construction efficiency is high, which effectively solves the technical problems in this technical field that have not been properly solved for many years.

[0007] Furthermore, among the multiple prefabricated UHPC plugging panels, some have widths smaller than those of the other prefabricated UHPC plugging panels, and the widths of these prefabricated UHPC plugging panels also differ from one another. With the above structure, multiple prefabricated UHPC plugging panels of the same width are first placed against each other for sealing. The remaining gap at the edge of the top frame of the subway shield's rectangular shaft can then be filled and sealed with one or more of these relatively small prefabricated UHPC plugging panels. This further ensures that the quality of the sealing concrete fully meets the design strength requirements and eliminates the need for formwork casting. Furthermore, the system can adapt to the concrete sealing needs of different subway shield shaft opening widths, making it more versatile.

[0008] Furthermore, the top frame of the subway shield's rectangular shaft features two stepped surfaces. The lower step houses the prefabricated UHPC trough-shaped plugging panels, while the upper step houses the ends of all or part of the first steel mesh used for cast-in-place concrete. This structure further enhances the mechanical properties, impact resistance, and compressive strength of the entire concrete plugging structure, resulting in higher-quality plugging concrete.

[0009] Furthermore, a second steel mesh is incorporated into each prefabricated UHPC trough-shaped plugging panel along its length and width. This structure further enhances the ultra-high-strength mechanical properties, impact resistance, and compressive strength of the prefabricated UHPC trough-shaped plugging panels, improving the quality of the plugging concrete within the concrete plugging structure.

[0010] Furthermore, the prefabricated UHPC plugging plates are all prefabricated UHPC channel-shaped plugging plates, and the openings of the channels of each prefabricated UHPC channel-shaped plugging plate face upward. With the above structure, the bite between the plugging plate and the cast-in-place reinforced concrete is better, the integrity of the concrete plugging structure is stronger, and the overall strength of the concrete plugging structure is further improved. The mechanical properties, impact resistance and compressive resistance of the concrete plugging structure are further improved.

[0011] Furthermore, the cross-section of each prefabricated UHPC channel-shaped plugging plate is mountain-shaped, and the second steel mesh is a steel mesh with mountain-shaped steel bars in the cross-section. With the above structure, the ultra-high strength mechanical properties, impact resistance and compressive resistance of multiple prefabricated UHPC channel-shaped plugging plates are further improved, and the quality of the plugging concrete in the concrete plugging structure is better.

[0012] Furthermore, there are U-shaped steel bars in the middle vertical plate of the mountain-shaped UHPC channel-shaped plugging plate, and U-shaped steel bars in the bottom plate and the two side vertical plates of the mountain-shaped UHPC channel-shaped plugging plate. Among them, the cross bar of the U-shaped steel bar is in the bottom plate, and the two vertical bars of the U-shaped steel bar are in the two side vertical plates. The U-shaped steel bars and the U-shaped steel bars are fixed to each other; among the multiple longitudinal steel bars extending along the length direction, the diameter of the steel bar at the intersection of the bottom plate and the vertical plate is larger than that of the other steel bars; one U-shaped steel bar and one U-shaped steel bar form a group of transverse steel bars, and multiple groups of transverse steel bars are arranged at intervals along the length direction, and multiple groups of transverse steel bars and multiple longitudinal steel bars are fixed to each other. With the above structure, the ultra-high strength mechanical properties, impact resistance and compressive resistance of multiple prefabricated UHPC channel-shaped plugging plates are further improved, and the quality of the plugging concrete in the concrete plugging structure is better.

[0013] Furthermore, the top surface of the cast-in-place reinforced concrete is flush with the top surface of the top frame of the rectangular shaft of the subway shield. With the above structure, the integration degree of the concrete plugging structure with the ground where it is located is better, and it can better meet the actual traffic needs.

[0014] Furthermore, the concrete plugging structure of the rectangular shaft of the subway shield of the present invention further includes several pairs of lifting lugs arranged along the length direction of the prefabricated UHPC channel-shaped plugging plate. With the above structure, it is convenient to lift during installation, making the construction convenient and further improving the construction efficiency. At the same time, the multiple pairs of upward convex lifting lugs can also enhance the anchoring effect between the prefabricated UHPC channel-shaped plugging plate and the cast-in-place concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a partial cross-sectional structural schematic diagram of the concrete plugging structure of the rectangular shaft of the subway shield of the present invention.

[0016] Figure 2 is Figure 1 the enlarged structural schematic diagram of A in

[0017] Figure 3 It is a schematic structural view of the precast UHPC grooved plugging plate in the present utility model.

[0018] Figure 4 is Figure 3 the schematic cross-sectional structure view of the precast UHPC grooved plugging plate in

[0019] Figure 5 is Figure 3 the schematic structural view of the connection between longitudinal steel bars and transverse steel bars in a vertical plate in

[0020] Figure 6 is Figure 5 the enlarged structural view of B in

[0021] Figure 7 It is a schematic structural view of the precast UHPC grooved plugging plate with lifting lugs installed in the present utility model.

[0022] Figure 8 It is a schematic structural view of three precast UHPC grooved plugging plates for filling gaps in the present utility model (lifting lugs not shown).

[0023] As shown in the figure:

[0024] 1. Rectangular shaft of subway shield, 11. Top frame, 111. Lower step surface, 112. Upper step surface, 113. Top surface of the frame;

[0025] 2. Precast UHPC grooved plugging plate, 21. U-shaped groove, 211. Opening, 22. Middle vertical plate, 23. Bottom plate, 24. Side vertical plate, 25. Transverse steel bars, 251. U-shaped steel bars, 252. C-shaped steel bars, 26. Longitudinal steel bars, 261. Top longitudinal steel bars, 262. First bottom longitudinal steel bars, 263. Second bottom longitudinal steel bars, 264. Overlapping part, 27. Lifting lugs;

[0026] 3. Cast-in-place reinforced concrete, 31. Top surface of the cast-in-place reinforced concrete. Specific embodiments

[0027] The following further describes the specific embodiments of the present utility model in conjunction with the accompanying drawings. It should be noted here that the description of these specific embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the following specific embodiments of the present utility model can be combined with each other as long as they do not conflict with each other.

[0028] Ultra-high performance concrete, referred to as UHPC (Ultra-High Performance Concrete), also known as reactive powder concrete (RPC), is the world's most innovative cement-based engineering material in recent decades, especially in the past decade or so, and has achieved a major leap in the performance of engineering materials. Ultra-high performance concrete itself has properties such as ultra-high strength mechanical properties, ultra-high toughness, high density, corrosion resistance, impact resistance and compressive strength. Ultra-high performance concrete is a mature technology, and its properties and formula are recorded in detail in online encyclopedias. Relevant technical standards such as CBMF XX-201X Technical Regulations for On-site Testing of Elastic Modulus of Structural Concrete have also been published. The present utility model does not improve the ultra-high performance concrete itself, but rather utilizes the existing ultra-high performance of ultra-high performance concrete, and adopts ultra-high performance concrete prefabricated UHPC trough-shaped sealing plates together with cast-in-place reinforced concrete to form the concrete sealing structure of the rectangular shaft of the subway shield. Those skilled in the art will understand that the casting process of each prefabricated UHPC trough-type plugging plate belongs to the existing technology, such as using metal, plastic or wood to make inner and outer molds, and mixing the ultra-high performance concrete mortar according to the existing technology formula, such as adding UHPC steel fiber and technical regulations, and pouring or pouring from the bottom up, and using tamping or vibration tools to cast the UHPC trough-type plugging plate of the utility model, also known as the ultra-high performance concrete trough-type plugging plate, into an integral shape or an integral casting shape, and solidify until the quality requirements specified for ultra-high performance concrete are met.

[0029] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown.

[0030] The concrete plugging structure for a rectangular subway shield shaft comprises a plurality of prefabricated UHPC plugging panels, each end resting on a stepped surface of the top frame 11 of the subway shield shaft 1, with adjacent prefabricated UHPC plugging panels abutting against each other. Cast-in-place reinforced concrete 3, or concrete poured on-site, is placed atop the prefabricated UHPC plugging panels. The cast-in-place reinforced concrete 3 is secured and sealed to the inner wall of the top frame 11 of the subway shield shaft 1.

[0031] Counteracting each other is also called abutting against each other, or adhering to each other, meaning there is no gap between them. The plurality of prefabricated UHPC trough-shaped plugging panels 2 can include a few, a dozen, or several dozen, such as more than twenty. It is readily understood that the cast-in-place reinforced concrete 3 can be ordinary concrete with a first reinforcement mesh, or alternatively, ultra-high performance concrete with a second reinforcement mesh.

[0032] The prefabricated UHPC plugging plates are preferably prefabricated UHPC channel-shaped plugging plates 2. The openings 211 of the U-shaped grooves 21 of each prefabricated UHPC channel-shaped plugging plate 2 preferably face upward.

[0033] Among multiple prefabricated UHPC plugging plates 2, there are several prefabricated UHPC plugging plates 2 with width dimensions smaller than those of other prefabricated UHPC plugging plates 2, and the width dimensions of these several prefabricated UHPC plugging plates 2 are also different from each other. For example, if the widths of the multiple prefabricated UHPC channel-shaped plugging plates 2 described above are all 1000 mm, that is, 1000 millimeters, then the widths of several of the prefabricated UHPC channel-shaped plugging plates 2 can be 100 mm for one piece, 200 mm for one piece, and 500 mm for one piece. In terms of meters, it can be expressed as the widths of the same multiple prefabricated UHPC channel-shaped plugging plates 2 are all 1 m, that is, 1 meter, then the widths of several of the prefabricated UHPC channel-shaped plugging plates 2 can be 0.1 meter for one piece, 0.2 meter for one piece, and 0.5 meter for one piece. These several, such as three prefabricated UHPC channel-shaped plugging plates 2, can be called prefabricated UHPC channel-shaped plugging plates 2 for filling gaps, and they can all be C-shaped plates with the openings facing upward. After adopting such a structure, the technical effects are very obvious: only three pieces are used in cooperation with the remaining multiple pieces, and it can be applied to the concrete plugging requirements of different and adaptable to different widths of the rectangular shaft openings of iron shield machines. Its mold opening cost is relatively low, and its versatility and wide adaptability are strong.

[0034] A second steel mesh is provided along the length and width directions inside each prefabricated UHPC channel-shaped plugging plate 2.

[0035] The cross-section of each prefabricated UHPC channel-shaped plugging plate 2 is mountain-shaped, and the second steel mesh is a steel mesh with a mountain-shaped steel bar in its cross-section.

[0036] In the middle vertical plate 22 of the width of each prefabricated UHPC channel-shaped plugging plate 2, such as a mountain-shaped UHPC channel-shaped plugging plate, there is a U-shaped steel bar 251. In the bottom plate 23 and the two side vertical plates 24 of each prefabricated UHPC channel-shaped plugging plate 2, such as a mountain-shaped UHPC channel-shaped plugging plate, there is a C-shaped steel bar 252. The crossbar of the C-shaped steel bar 252 is in the bottom plate 23, and the two vertical bars of the C-shaped steel bar 252 are in the two side vertical plates 24. The U-shaped steel bar 251 and the C-shaped steel bar 252 are fixed to each other, such as by tying or welding. Among the multiple longitudinal steel bars 26 extending along the length direction, the diameter of the steel bar at the intersection of the bottom plate 23 and the vertical plates (including the middle vertical plate 22 and the side vertical plate 24) is greater than the diameters of the remaining steel bars. One U-shaped steel bar 251 and one C-shaped steel bar 252 form a group of transverse steel bars 25. Multiple groups of transverse steel bars 25 are arranged at intervals along the length direction, and multiple groups of transverse steel bars 25 and multiple longitudinal steel bars 26 are fixed to each other, such as by tying or welding. The side vertical plate 24 can also be called a side plate. The two side vertical plates 24 can also be called two side vertical plates 24.

[0037] The longitudinal steel bars 26 can be arranged according to the following specific structure: the two ends of a top longitudinal steel bar 261 in one side vertical plate 24 are bent downward by 90°, and the two ends of a bottom first longitudinal steel bar 262 in one side vertical plate 24 are bent upward, and the bent sections at both ends partially overlap and are fixed to each other. The two ends of a top longitudinal steel bar 261 in the other side vertical plate 24 are bent downward by 90°, and the two ends of a bottom first longitudinal steel bar 262 in the other side vertical plate 24 are bent upward, and the bent sections at both ends partially overlap and are fixed to each other, such as by binding or welding. The two ends of the two top longitudinal steel bars 261 in the middle vertical plate 22 in the middle of the width are bent downward by 90°, and the two ends of the two bottom first longitudinal steel bars in the middle vertical plate 22 in the middle of the width are bent upward. The bent sections at both ends of one of them partially overlap and are fixed to each other, such as by binding or welding, and the bent sections at both ends of the other one also partially overlap and are fixed by binding or welding. The partial overlap of the bent sections at both ends is also called the overlapping part 264. The above-mentioned top longitudinal steel bar 261 is a longitudinal steel bar 26 with a relatively small diameter. The above-mentioned bottom first longitudinal steel bar 262 is a longitudinal steel bar 26 with a relatively large diameter. Except for the first longitudinal steel bars with a relatively large diameter at the intersections with the vertical plates in the bottom plate 23 described above, the remaining multiple longitudinal steel bars 26 in the bottom plate 23 are all bottom second longitudinal steel bars 263 with a relatively small diameter, and the two ends of the bottom second longitudinal steel bars 263 do not bend upward.

[0038] The above-mentioned multiple bars can be understood in this way: the bottom first longitudinal steel bars 262 can be several or more than a dozen or dozens, such as more than twenty. The multiple bars of the top longitudinal steel bars 261 and the bottom second longitudinal steel bars 263 together can be more than a dozen or dozens, such as more than twenty, more than thirty, etc. The U-shaped steel bars 251 can be dozens or hundreds and dozens, etc., and the C-shaped steel bars 252 can be dozens or hundreds and dozens, etc. That is, the multiple groups in the multiple groups of transverse steel bars 25 fixed to the multiple longitudinal steel bars 26 can be dozens of groups or hundreds and dozens of groups, etc. It is not difficult to understand that since the first steel bars in the cast-in-place reinforced concrete 3 are not drawn and not marked. Therefore, the above-mentioned bottom first longitudinal steel bars 262 and bottom second longitudinal steel bars 26 are both longitudinal steel bars in the second steel mesh.

[0039] Each precast UHPC plugging plate can also be a flat plate with a rectangular cross-section, or a C-shaped trough plate with an upward opening, etc., and the second steel mesh can also be other specific structures. Of course, the structure of each precast UHPC trough-shaped plugging plate 2 described above is a preferred structure. The precast UHPC trough-shaped plugging plate 2, also called the precast UHPC trough-shaped plate, can also be called the precast UHPC plugging trough plate.

[0040] The step surface of the top frame 11 of the rectangular vertical shaft 1 of the subway shield is preferably a two-level step surface. The lower step surface 111 is used to place the prefabricated UHPC trough-shaped blocking plate 2, and the upper step surface 112 is used to place the ends of all or part of the steel bars of the first steel mesh of the in-situ reinforced concrete 3.

[0041] The top surface 31 of the cast-in-situ reinforced concrete is flush with the frame top surface 113 of the top frame 11 of the subway shield rectangular shaft 1. Flush is also called level.

[0042] The concrete plugging structure for a rectangular shaft of a subway shield tunnel according to the present invention may further include several pairs of lifting lugs disposed along the length of the prefabricated UHPC trough plugging panels. Specifically, several pairs, such as three pairs, of lifting lugs 27 may be provided on the two side vertical panels 24 of each prefabricated UHPC trough plugging panel 2. These pairs of lifting lugs 27 are spaced apart along the length, such as with a pair of lifting lugs 27 positioned near each end and a pair of lifting lugs 27 positioned in the middle of each prefabricated UHPC trough plugging panel 2. Each lifting lug may be shaped like a "J" (a cross), with the two horizontal cross sections at the bottom of each lifting lug being secured, for example, by tying or welding, to the steel bars within the respective side vertical panels 24.

[0043] The prefabricated UHPC plugging plate can also be called a prefabricated UHPC plugging pad. The prefabricated UHPC slot-shaped plugging plate 2 can also be called a prefabricated UHPC slot-shaped plugging pad.

[0044] The above-mentioned parts, structures, quantities, etc. that are not marked are not shown in the drawings, and some parts are not marked in the drawings. The drawings are for illustration only. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A concrete plugging structure for a rectangular shaft of a subway shield, characterized by: It includes multiple precast UHPC sealing plates with both ends resting on the step surfaces of the top frame of the rectangular shaft of the subway shield tunneling machine. Adjacent precast UHPC sealing plates abut against each other. There is cast-in-place reinforced concrete on the top of the multiple precast UHPC sealing plates, and the perimeter of the cast-in-place reinforced concrete is fixed and sealed with the inner wall of the top frame of the rectangular shaft of the subway shield tunneling machine.

2. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 1 is characterized in that: Among the multiple precast UHPC sealing plates, there are several precast UHPC sealing plates with width dimensions smaller than those of the other precast UHPC sealing plates, and the width dimensions of these several precast UHPC sealing plates are also different from each other.

3. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 1 is characterized in that: The step surface of the top frame of the rectangular shaft of the subway shield tunneling machine is a two-level step surface. The lower step surface supports the precast UHPC trough-shaped sealing plate, and the upper step surface is for supporting the ends of all the steel bars or the ends of some of the steel bars of the first steel mesh for the cast-in-place concrete.

4. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 1 is characterized in that: A second steel mesh is provided along the length and width directions inside each precast UHPC trough-shaped sealing plate.

5. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 4 is characterized in that: All the precast UHPC sealing plates are precast UHPC trough-shaped sealing plates, and the openings of the troughs of each precast UHPC trough-shaped sealing plate face upward.

6. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 5, characterized in that: The cross-section of each precast UHPC trough-shaped sealing plate is in a mountain shape, and the second steel mesh is a steel mesh with a cross-section provided with mountain-shaped steel bars.

7. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 6, characterized in that: There are zigzag-shaped steel bars in the middle vertical plate of the mountain-shaped UHPC trough-shaped sealing plate in terms of width, and there are C-shaped steel bars in the bottom plate and the two side vertical plates of the mountain-shaped UHPC trough-shaped sealing plate. Among them, the crossbar of the C-shaped steel bar is in the bottom plate, and the two vertical bars of the C-shaped steel bar are in the two side vertical plates. The zigzag-shaped steel bars and the C-shaped steel bars are fixed to each other. Among the multiple longitudinal steel bars extending along the length direction, the diameter of the steel bar at the intersection of the bottom plate and the vertical plate is larger than that of the remaining steel bars. One zigzag-shaped steel bar and one C-shaped steel bar form a group of transverse steel bars, and multiple groups of transverse steel bars are arranged at intervals along the length direction. The multiple groups of transverse steel bars and the multiple longitudinal steel bars are fixed to each other.

8. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 1 is characterized by: The top surface of the cast-in-place reinforced concrete is flush with the top surface of the frame of the top frame of the rectangular shaft of the subway shield tunneling machine.

9. The concrete plugging structure for a rectangular shaft of a subway shield according to claim 1, characterized in that: It also includes several pairs of lifting lugs arranged along the length direction of the precast UHPC trough-shaped sealing plate.

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