Shield well structure for starting construction of large-diameter shield box

Abstract

The utility model discloses a shield well structure for large-diameter shield box starting construction, which comprises a box starting section provided with a backfilling structure. A reinforcing structure with the width equal to that of the three-ring shield segment is constructed at the end of the box body starting section; the inner side of the well wall of the box body starting section is connected with a temporary concrete reaction wall through reserved steel bars, and a temporary supporting structure is arranged on the temporary concrete reaction wall. A hole is reserved in the middle of the temporary concrete reaction wall, and the inner diameter of the hole is the same as that of a shield segment. According to the utility model, the adverse effect of the limitation of the surrounding environment on the shield launching is overcome, the application scene of the shield construction is greatly enriched, and the engineering risk of the shield launching in a narrow space is reduced. Compared with barrel starting of an all-steel structure, the construction cost of the permanent and temporary combined reinforced concrete box structure is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of shield construction, especially a shield well structure for large-diameter shield box body starting construction. BACKGROUND

[0002] When a conventional shield starts, to avoid water and soil gushing at the portal, prevent ground subsidence, and ensure construction safety, a soil reinforcement area with a length, width, and depth greater than the shield body needs to be constructed at the end of the shield well, and the reinforcement range is determined according to the size of the shield machine. However, due to the limitation of the surrounding environment, the end of the shield well often does not have enough space for the hoisting of the shield machine and the reinforcement of the soil, especially for large-diameter shields, which require more construction space. Therefore, to ensure the smooth starting of the shield, the empty pushing and box starting method can be used.

[0003] In summary, the significance of the present application lies in:

[0004] Compared with the conventional shield starting method, the shield empty pushing and box starting method only needs to construct a reinforcement area with a length of at least 3 times the width of the shield segment at the end of the shield well, which greatly reduces the required construction range, and the hoisting of the shield machine can be flexibly selected at an appropriate position according to the surrounding environment. By empty pushing in the shield well to avoid high-risk areas for hoisting, the application scenarios of shield construction are greatly enriched, and the engineering risks of shield starting in a small space are greatly reduced. Compared with the full-steel structure cylinder starting, the steel reinforced concrete box structure of permanent and temporary combination also reduces the engineering cost. SUMMARY

[0005] According to the above problems, the present application proposes a shield well structure for large-diameter shield box body starting construction, and the specific scheme is as follows:

[0006] A shield well structure for large-diameter shield box body starting construction, comprising a box starting section, the box starting section is provided with a backfill structure; a reinforcement structure with a width of a shield segment is constructed at the end of the box starting section; a temporary concrete counterfort wall is connected to the inner side of the well wall of the box starting section through reserved steel bars, and a temporary support structure is arranged on the temporary concrete counterfort wall; a hole is reserved in the middle of the temporary concrete counterfort wall, and the hole has the same diameter as the shield segment.

[0007] Preferably, the width of the reinforcement structure is at least 3 times the width of the shield segment.

[0008] Further preferably, the reinforcement structure comprises a reinforced soil body and a plain concrete wall arranged in sequence, and the plain concrete wall is located at the periphery and has a depth from the ground to the bottom of the reinforcement structure.

[0009] Preferably, the inner side of the well wall of the box starting section and the temporary concrete counterfort wall are connected to a temporary concrete top sealing plate through reserved steel bars.

[0010] The backfill structure comprises a filling material backfilled upwards from the bottom plate and backfill soil applied above the temporary concrete top sealing plate.

[0011] Preferably, the temporary support structure comprises temporary concrete supports connected with the temporary concrete counterforce wall through reserved steel bars, and the angle between the central axis of the temporary concrete supports and the temporary concrete counterforce wall is not less than 45°.

[0012] Further preferably, the temporary support structure comprises annular hidden beams arranged on the temporary concrete counterforce wall, the annular hidden beams are connected with the temporary concrete supports, and grooves with the same thickness as the shield segments are reserved on the annular hidden beams.

[0013] Further preferably, the temporary support structure comprises rectangular hidden beams arranged on the temporary concrete counterforce wall, the rectangular hidden beams are connected with the temporary concrete supports, and grooves with the same thickness as the shield segments are reserved at the intersection positions of the rectangular hidden beams and the shield segments.

[0014] Further preferably, the filling material is self-compacting material with fluidity and thixotropy.

[0015] Further preferably, the backfill soil is material with uniform density, and the total weight of the backfill soil is balanced with the shield well starting pressure.

[0016] The utility model discloses the beneficial effects are:

[0017] Utilize the permanent shield starting well structure, realize big diameter shield machine in shield well empty push, can be more flexible shield machine hoisting position. Form the sealed reinforced concrete box of permanent and temporary combination in combination with temporary concrete top sealing plate, temporary concrete counterforce wall, temporary concrete support, fill the backfill material in the box to balance the pressure when shield starting in and out, supplement with the end reinforcement of shield starting well, realize the shield box starting under the narrow space environment.

[0018] Compared with the conventional shield starting mode, the utility model overcomes the limitation of the surrounding environment on shield hoisting and end reinforcement, especially realizes the empty push and box starting of the big diameter shield, fills the blank of the domestic big diameter shield box starting, enriches the application scene of shield construction, and reduces the engineering risk of shield starting under the narrow space. BRIEF DESCRIPTION OF DRAWINGS

[0019] The technical scheme of the utility model will be described in further detail below in combination with the drawings and embodiments, but it should be known that these drawings are only designed for the purpose of explanation, and therefore, they are not as the limitation of the range of the utility model. In addition, unless specifically pointed out, these drawings only intend to conceptually illustrate the structural configuration described here, and are not necessarily drawn in proportion.

[0020] Figure 1 It is a three-dimensional model schematic view of the shield launching shaft in the utility model;

[0021] Figure 2 It is a design drawing of the box body launching section in the utility model;

[0022] Figure 3 It is a structure cross section schematic view of the box body launching section in the utility model;

[0023] Figure 4 It is a reinforcement drawing of the temporary concrete counterforce wall in the utility model;

[0024] Figure 5 It is a reinforcement drawing of the temporary concrete top sealing plate in the utility model;

[0025] Figure 6 It is a structure longitudinal section schematic view of the box body launching section in the utility model;

[0026] Figure 7 It is a detail drawing of the temporary concrete support and wall and plate connecting joint in the utility model;

[0027] Figure 8 It is a transverse section view of the box body launching section in the utility model;

[0028] Figure 9 It is a transverse section view of the empty pushing launching section in the utility model;

[0029] Figure 10 It is a transverse section view of the shield hoisting section in the utility model;

[0030] Figure 11 It is a bottom plate plan view of the shield launching shaft in the utility model;

[0031] Figure 12 It is a top plate plan view of the shield launching shaft in the utility model;

[0032] Figure 13 It is a longitudinal section view of the shield launching shaft in the utility model.

[0033] In the drawing:

[0034] 1, shield launching shaft; 101, box body launching section; 102, empty pushing standard section; 103, shield hoisting section;

[0035] 2, temporary concrete top sealing plate; 3, temporary concrete counterforce wall; 4, temporary concrete support; 5, annular hidden beam; 6, rectangular hidden beam; 7, filling material; 8, backfill soil; 9, reinforced soil; 10, plain concrete wall. DETAILED DESCRIPTION

[0036] First of all, it needs to be pointed out that the specific structure, characteristics and advantages of the utility model will be specifically described in the following example way, however, all the descriptions are only used for illustration, and should not be understood as any limitation on the utility model. In addition, any single technical feature described or implied in each embodiment mentioned in the present text, or any single technical feature shown or implied in each drawing, can still continue to be combined or deleted between these technical features, so as to obtain more other embodiments of the utility model which can not be directly mentioned in the present text. In addition, for the purpose of simplifying the drawing, the same or similar technical features can be marked only in one place in the same drawing.

[0037] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screw connection" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the above-mentioned terms in the utility model can be understood according to the specific meaning of the above-mentioned terms in the utility model according to the specific situation.

[0038] The specific structure, characteristics and advantages of the utility model will be specifically described in the following example way, however, all the descriptions are only used for illustration, and should not be understood as any limitation on the utility model. In addition, any single technical feature described or implied in each embodiment mentioned in the present text, or any single technical feature shown or implied in each drawing, can still continue to be combined or deleted between these technical features, so as to obtain more other embodiments of the utility model which can not be directly mentioned in the present text. In addition, for the purpose of simplifying the drawing, the same or similar technical features can be marked only in one place in the same drawing. Figure 1 -Appendix Figure 13 The utility model is specifically described.

[0039] Embodiment 1:

[0040] A shield well structure for large-diameter shield box launching construction, comprising a box launching section 101, wherein the box launching section 101 is provided with a backfill structure; the end of the box launching section 101 is provided with a reinforcing structure with a width of a shield segment; the inner side of the well wall of the box launching section 101 is connected with a temporary concrete counterfort wall 3 through reserved steel bars; the temporary concrete counterfort wall 3 is provided with a temporary support structure; a hole is reserved in the middle of the temporary concrete counterfort wall 3, and the hole has the same diameter as the inner diameter of the shield segment.

[0041] Working principle:

[0042] The utility model utilizes the existing permanent shield launching well structure to realize the air pushing of the large-diameter shield machine with a diameter of 14.31 m in the shield well. Figure 1 As shown in the figure, the shield well comprises a box launching section 101, an air pushing standard section 102 and a shield hoisting section 103 connected in sequence.

[0043] The internal net length of the shield launching shaft 1 structure shall meet the minimum requirements of shield launching; the net size of the shield hoisting section 103 and the box launching section 101 is not less than 18m (width) * 22m (length), the distance from the bottom plate to the outer skin of the shield segment is not less than 1.5m; the net width of the empty pushing standard section 102 is not less than 16.8m, and the distance from the bottom plate to the outer skin of the shield segment is not less than 0.6m. This structure shall meet the bearing capacity requirements of the permanent stage and the construction stage at the same time, and the structure needs to reserve the connecting steel bars with the temporary structure.

[0044] In order to realize the shield box launching in a narrow space environment, the structure of the box launching section 101 is improved in the application. The box launching section 101 refers to a reinforced concrete structure section arranged in the shield launching shaft 1 for launching the shield machine.

[0045] As shown in the accompanying drawings, Figure 11 As shown in the accompanying drawings, Figure 13 It can be seen that the box launching section 101 includes a temporary concrete counterforce wall 3, a first-poured cross beam of the permanent structure, a ring frame beam, a buttress column and other components, forming a solid structure to bear the counterforce when the shield machine is pushed.

[0046] The box launching section 101 is a sealed reinforced concrete box combined with permanent and temporary structures, which includes various reinforced concrete components, such as first-poured cross beams, ring frame beams, buttress columns and hidden columns. These components are connected by pre-embedded steel bars to form an integral whole to bear the load of the shield machine and the ground load.

[0047] In the application, as shown in the accompanying drawings, Figure 5 The first-poured cross beam and the temporary concrete top plate 2 are connected at the intersection by pre-embedded steel bars to bear the counterforce of the shield machine and transfer the load to the surrounding structure.

[0048] As shown in the accompanying drawings, Figure 8 As shown in the accompanying drawings, Figure 10 The ring frame beam is arranged at the launching position of the shield machine and surrounds the contour of the shield machine, together with the temporary concrete counterforce wall 3, to directly bear the counterforce when the shield machine is pushed. The ring frame beam is connected with the surrounding structure, such as the first-poured cross beam and the buttress column, by pre-embedded steel bars or cast-in-place concrete.

[0049] The buttress column is arranged on the side wall of the shield shaft to provide lateral support and enhance the stability of the structure. The buttress column is connected with the ring frame beam and the first-poured cross beam by pre-embedded steel bars or cast-in-place concrete to form an integral structure.

[0050] The hidden column is connected with the surrounding beams and plates by steel bars to form an integral reinforced concrete structure, which is used to enhance the rigidity and strength of the structure.

[0051] The temporary concrete counterforce wall 3 adopts a reinforced concrete structure, which is connected with the permanent reinforced concrete shield launching shaft 1 through reserved steel bars, can bear the shield launching thrust, and has a middle reserved hole with the same diameter as the shield segment, which will be removed after the shield launching is completed. The temporary concrete counterforce wall 3 comprises a temporary support structure, which will also be removed after the shield launching is completed.

[0052] Meanwhile, the box launching section 101 is filled with suitable backfill structures inside and outside the box, which is used to balance the pressure during the shield launching, and a reinforcing structure with the width of the shield segment is arranged at the end of the shield launching shaft 1, so as to realize the shield box launching in a narrow space.

[0053] Further, in the embodiment, the reinforcing structure can have a width of at least 3 times the width of the shield segment.

[0054] In the embodiment, the reinforcing depth and width need to meet the conventional shield launching requirements, the reinforcing length is at least 3 times the width of the segment, and the width of the 3-ring shield segment is suitable for a large-diameter shield machine. The reinforcing method can be selected according to the geological conditions and the surrounding environment.

[0055] Further, in the embodiment, the reinforcing structure can comprise a reinforced soil body 9 and a plain concrete wall 10 arranged in sequence, and the plain concrete wall 10 is located at the periphery and has a depth from the ground to the bottom of the reinforcing structure.

[0056] In the embodiment, the reinforcing structure indicators need to meet the conventional shield launching reinforcing requirements, for example, as shown in the figure, the periphery of the reinforcing structure is closed by a plain concrete wall 10. Figure 2

[0057] The thickness of the plain concrete wall 10 is 800 mm, which is located at the periphery of the reinforcing body and has a depth from the ground to the bottom of the reinforcing body.

[0058] Further, in the embodiment, the inner side of the shaft wall of the box launching section 101 and the temporary concrete counterforce wall 3 are connected with the temporary concrete capping slab 2 through reserved steel bars.

[0059] The backfill structure comprises filling materials 7 filled upwards from the bottom plate and backfill soil 8 arranged above the temporary concrete capping slab 2.

[0060] In the embodiment, as shown in the figure, the temporary concrete capping slab 2 adopts a reinforced concrete structure, which is connected with the permanent reinforced concrete shield launching shaft 1 through reserved temporary capping slab reinforcement, can bear the shield launching pressure, and will be removed after the shield launching is completed. The backfill structure will also be removed after the shield launching is completed. Figure 5

[0061] ​​At the same time, the bottom of the box body starting section 101 is a permanent structure of the floor structure which will not be removed after the completion of the shield starting.

[0062] Further, it can also be considered in the embodiments that the temporary support structure includes a temporary concrete support 4 connected with the temporary concrete counterforce wall 3 through reserved steel bars, and the angle between the central axis of the temporary concrete support 4 and the temporary concrete counterforce wall 3 is not less than 45°.

[0063] In the embodiments, as shown in Figure 6 , the temporary concrete support 4 adopts a reinforced concrete structure, one end of which is connected with the steel bars of the temporary concrete counterforce wall 3, and the other end is connected with the bottom of the box body starting section 1, or the top of the box body starting section 1, or the main steel bars of the wall or the plate. In general, it is connected with where it can provide support connection. The temporary concrete support 4 can bear the shield starting thrust, the central axis of the structure is not less than 45° with the angle of the temporary shield starting concrete counterforce wall 3, and it will also be removed after the completion of the shield starting.

[0064] At the same time, in order to enhance the support strength, as shown in Figure 7 , the steel bars of the temporary concrete support 4 can also adopt a steel bar connection in the shape of an acute angle formed by support main steel bars and stirrups.

[0065] The support main steel bars can be further increased with axillary angle reinforcing steel bars for strengthening the support strength. The axillary angle reinforcing steel bars form a 90° angle to strengthen the support main steel bars.

[0066] Further, it can also be considered in the embodiments that the temporary support structure includes a ring-shaped hidden beam 5 arranged on the temporary concrete counterforce wall 3, the ring-shaped hidden beam 5 is connected with the temporary concrete support 4, and a groove with the same thickness as the shield segment is reserved on the ring-shaped hidden beam 5.

[0067] In the embodiments, the counterforce wall reinforcing bars of the temporary concrete counterforce wall 3 need to be truncated and bent 15d after extending to the hole of the temporary concrete counterforce wall 3, and then anchored into the ring-shaped hidden beam 5, which has stronger structural stability.

[0068] Further, it can also be considered in the embodiments that the temporary support structure includes a rectangular hidden beam 6 arranged on the temporary concrete counterforce wall 3, the rectangular hidden beam 6 is connected with the temporary concrete support 4, and a groove with the same thickness as the shield segment is reserved at the position where the rectangular hidden beam 6 intersects with the shield segment.

[0069] In the above embodiments, as shown in Figure 3 , Figure 4 , Figure 6 , the ring-shaped hidden beam 5 and the rectangular hidden beam 6 both adopt a reinforced concrete structure for bearing the shield starting thrust.

[0070] The recess in the embodiment is used for matching the shield segment. In the implementation, the shield machine is adjusted to be aligned with the reserved hole of the temporary concrete counterforce wall 3, at least one ring of shield segments is assembled and embedded in the recess, reliable water stopping measures are adopted between the shield segments and the temporary concrete counterforce wall 3, so as to play a sealing role and prevent sliding or deviation during the advancing process. The force is uniformly transmitted to the temporary concrete counterforce wall 3 through the recess, so as to ensure that the temporary concrete counterforce wall 3 can bear larger advancing force. The annular hidden beam 5 and the rectangular hidden beam 6 are removed after the shield launching is completed.

[0071] Further, in the embodiment, the filling material 7 can be a self-compacting material with fluidity and thixotropy. In the embodiment, the self-compacting material includes but is not limited to sand, inert mortar and the like, and is removed after the shield launching is completed.

[0072] Further, in the embodiment, the backfill 8 can be a material with uniform density, and the total weight of the material is balanced with the shield launching pressure. In the embodiment, the material has uniform density, the total weight of the material is balanced with the shield launching pressure, and the material is removed after the shield launching is completed.

[0073] During the shield launching, the shield machine is hoisted into the shield launching shaft 1 from the shield hoisting section 103, and is pushed into the box launching section 101 through the empty pushing standard section 102. Before the shield launching, the appropriate backfill material is filled in and outside the box to balance the pressure during the shield launching, and the end reinforcement of the 3-ring tunnel shield segment on the end of the shield launching 1 is supplemented, so that the large-diameter shield empty pushing and the box launching can be realized in a narrow space environment.

[0074] Working process:

[0075] The following will be described in combination with the accompanying drawings Figure 1 - the accompanying drawings Figure 13 Further, the specific implementation steps of the utility model will be described.

[0076] (1) Before the main structure foundation pit of the shield launching shaft 1 is excavated, the reinforced soil 9 and the plain concrete wall 10 are constructed on the end of the shield launching shaft 1 according to the geological conditions and the surrounding environment.

[0077] (2) The foundation pit of the shield launching shaft 1 is constructed, and the shield launching shaft structure 1 is constructed;

[0078] (3) The shield machine is hoisted into the shield launching shaft 1 from the shield hoisting section 103, and is pushed into the box launching section 101 through the empty pushing standard section 102 after the assembly is completed;

[0079] (4) The temporary concrete counterforce wall 3, the annular hidden beam 5 and the rectangular hidden beam 6 are constructed, and the temporary concrete support 4 is constructed after the temporary concrete counterforce wall reaches the design strength;

[0080] (5) adjust the position of the shield machine to be aligned with the reserved hole of the counterforce wall 3, assemble at least one ring of shield segments and embed them in the reserved groove of the temporary counterforce wall, and meanwhile use reliable water stopping measures;

[0081] (6) fill the material 7 from the bottom plate to the bottom of the temporary concrete top sealing plate 2, and construct the temporary concrete top sealing plate 2. After the temporary top sealing plate reaches the design strength, press the backfill soil 8 above the temporary top sealing plate;

[0082] (7) start the shield box, after the start is completed, inject water stopping material into the pipe segment grouting hole in the range of the reinforced soil 9 to fill the gap between the pipe segment and the reinforced area; after a certain number of rings are excavated, the backfill soil 8, the temporary concrete top sealing plate 2 and the filling material 7 around the pipe segment in the well are removed, and the layers are excavated and cleaned, and attention should be paid to the water stopping at the interface to prevent the infiltration of underground water outside the well into the well; after the well sand cleaning is completed, the shield pipe segment and the temporary concrete counterforce wall 3 and the temporary concrete support 4 in the well are removed layer by layer;

[0083] (8) construct the permanent portal ring beam at the start hole, and after the excavation is completed, pour the post-poured transverse beam, post-poured longitudinal beam and permanent structure top plate above the box start section 101, and connect them at the intersection.

[0084] Compared with the conventional shield starting mode, the utility model adopts a permanent and temporary combined reinforced concrete shield well, realizes the design of large-diameter shield empty pushing and box starting, solves the problem that the reinforcement range of the shield well end in a narrow space does not meet the conventional design, the shield machine hoisting position of the utility model is more flexible, the adverse effects of the surrounding environment limitation on the shield starting are overcome, the application scenarios of the shield construction are enriched, and the engineering risks of the shield starting in a narrow space are reduced. Compared with the full steel structure cylinder starting, the permanent and temporary combined reinforced concrete box engineering cost is also relatively reduced.

[0085] The above embodiments have been described in detail, but the content described can only be the preferred embodiments of the utility model, and cannot be considered as limiting the implementation range of the utility model. Any equivalent changes and improvements made within the scope of the utility model application shall still belong to the patent coverage range of the utility model.

Claims

1. A shield launching pit structure for a large diameter shield launching, characterized in that: The box originating section (101) is provided with backfill structure; the end of the box originating section (101) is provided with reinforcement structure like the width of shield segment; the inner side of shaft wall of the box originating section (101) is connected with temporary concrete counterforce wall (3) through reserved steel bars, and temporary support structure is arranged on the temporary concrete counterforce wall (3); the middle part of the temporary concrete counterforce wall (3) is provided with hole, and the hole has the same diameter as the inner diameter of shield segment.

2. The shield well structure for the launching construction of a large-diameter shield case according to claim 1, characterized in that: The width of the reinforcement structure is at least the width of 3 shield segments.

3. The shield launching shaft structure for large diameter shield launching construction according to claim 2, characterized in that: The reinforcement structure comprises reinforcement soil body (9) and plain concrete wall (10) arranged in sequence, and the plain concrete wall (10) is located at the periphery and has a depth from the ground to the bottom of the reinforcement structure.

4. The shield well structure for launching construction of a large-diameter shield box according to claim 1, characterized in that: The inner side of shaft wall of the box originating section (101) and the temporary concrete counterforce wall (3) are connected with temporary concrete top sealing plate (2) through reserved steel bars; The backfill structure comprises filling material (7) backfilled upwards from the bottom plate and backfill soil (8) arranged above the temporary concrete top sealing plate (2).

5. The shield well structure for launching a large diameter shield machine according to claim 1, wherein: The temporary support structure comprises temporary concrete support (4) connected with the temporary concrete counterforce wall (3) through reserved steel bars, and the angle between the central axis of the temporary concrete support (4) and the temporary concrete counterforce wall (3) is not less than 45°.

6. The shield launching shaft structure for large diameter shield launching according to claim 5, characterized in that: The temporary support structure comprises annular hidden beam (5) arranged on the temporary concrete counterforce wall (3), the annular hidden beam (5) is connected with the temporary concrete support (4), and recesses with the same thickness as the shield segment are reserved on the annular hidden beam (5).

7. The shield launching shaft structure for large diameter shield launching according to claim 5, characterized in that: The temporary support structure comprises rectangular hidden beam (6) arranged on the temporary concrete counterforce wall (3), the rectangular hidden beam (6) is connected with the temporary concrete support (4), and recesses with the same thickness as the shield segment are reserved on the rectangular hidden beam (6) at the intersection position with the shield segment.

8. The shield launching shaft structure for large diameter shield launching according to claim 4, characterized in that: The filling material (7) is self-compacting material with fluidity and thixotropy.

9. The shield launching shaft structure for large diameter shield launching according to claim 4, characterized in that: The backfill soil (8) is material with uniform density, and the total weight of the backfill soil (8) is balanced with the shield shaft originating pressure.

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