Shield construction method and device for ultra-sharp curve and extremely-shallow soil covering

Abstract

The invention relates to the related technical field of shield construction, in particular to a shield construction method and device for ultra-sharp curve and extremely shallow covering soil, and the construction method comprises the processes of excavation face soil pressure monitoring, grouting management, slag discharge amount calculation and soil discharge management, test simulation construction and shield curve tunneling. The method comprises the following steps: measuring a preceding section and a subsequent section before and after tunneling, and injecting an inert filling material into the outer side of a shield shell on the inner side 1 of a turning curve, so that a shield head is slowly corrected; shield construction is conducted through an ultra-sharp curve and ultra-shallow covering soil shield construction method composed of excavation face soil pressure monitoring, grouting management, deslagging amount calculation and soil discharging management, test simulation construction and the shield curve tunneling process, inert filling materials are injected into the outer side of a shield shell on the inner side 1 of a turning curve, so that the head angle of a shield tunneling machine is slowly corrected, and the shield tunneling efficiency is improved. The effect of controlling the posture of the shield is achieved, and large disturbance to the stratum due to the fact that deviation is too large is avoided.

Description

Technical Field

[0001] The invention relates to the technical field related to shield construction, and in particular to a shield construction method and device for an ultra-sharp curve and extremely shallow soil cover. Background Art

[0002] The shield method is a fully mechanized construction method in the dark excavation method. It pushes the shield machine into the ground, and supports the surrounding rock with the shield shell and segments to prevent collapse into the tunnel. At the same time, the soil is excavated in front of the excavation face with a cutting device, transported out of the cave by an excavation machine, and pushed forward by a jack at the rear, and prefabricated concrete segments are assembled to form a mechanized construction method of the tunnel structure;

[0003] The shield method in the prior art is difficult to construct at the end of a super-sharp curve, and usually the construction is carried out by increasing the radius of the turning point, but this will lead to an increase in the construction period and an increase in construction costs. For this reason, the present invention proposes a shield construction method and device for super-sharp curves and extremely shallow cover to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a shield construction method and device for ultra-sharp curve and extremely shallow soil cover, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a shield construction method for super-sharp curve and extremely shallow soil covering, comprising:

[0006] Excavation surface soil pressure monitoring, by installing an earth pressure gauge on the top of the front shield to monitor the excavation surface soil pressure in real time;

[0007] Grouting management, by configuring injection holes on the top of the shield machine to inject soil maintenance filler;

[0008] Calculate the discharge volume and manage the soil discharge. In the shallow covering area, manage the volume and weight of the soil carried by each muck truck. During the excavation process, use measuring equipment to measure the loading height and weight of the muck truck based on the cylinder stroke length corresponding to the earthwork volume of the muck truck.

[0009] Test simulation construction, in order to better control the excavation parameters of shield shallow cover construction, simulate similar working conditions, and conduct test construction in the range of 1.5D to 2.0D. During the excavation process, ground staff monitor the stratum deformation of the excavation face section and shield tail section of each ring in real time; measure the leading section and the following section before and after the excavation starts;

[0010] During the shield curve excavation process, inert filling material is injected into the outer side of the shield shell on the inner side of the turning curve to allow the shield head to be slowly corrected.

[0011] Preferably, the soil-maintaining filler is prepared from special clay, water, and a plastic strength regulator, and the inert filler material is composed of: 25-40% bentonite, 18-25% inorganic powder, 12-22% superplasticizer, 0.2-0.5% water retainer, 0.5-1.0% antifreeze, and the balance is water.

[0012] Preferably, the shield machine is equipped with two sets of synchronous grouting systems to fill the building gaps as quickly as possible, and a combination of polymer additives and mineral-based additives is used. At the same time, the synchronous grouting liquid at the tail of the shield adopts a quick-setting ratio, and the setting time is controlled within 5s. Since the shallow overburden interval is a sand layer with a low fine-grained content, the use of polymer additives, mineral-based additives and quick-setting ratios can ensure the plastic fluidity of soil and sand and avoid gushing during excavation.

[0013] A shield construction device for super-steep curves and extremely shallow soil cover, the shield construction device for super-steep curves and extremely shallow soil cover is used to implement the above-mentioned shield construction method for super-steep curves and extremely shallow soil cover. After the shield curve excavation process is carried out, a tunnel structure is formed by installing pipe segments in the shield cavity, each side of the pipe segment is provided with a mounting hole, and a nut groove is provided on the inner side of the pipe segment at the port of the mounting hole, and adjacent pipe segments are positioned and connected by pipe segment positioning pieces during actual installation, and the pipe segment positioning pieces are composed of a connecting rod, a first positioning nut and a second positioning nut.

[0014] Preferably, the mounting hole is an arc-shaped slot, the connecting rod is an arc-shaped rod, and threaded rods are integrally formed at both ends of the connecting rod, the curvature value of the mounting hole coincides with the curvature value of the connecting rod, and the diameter value of the threaded rod is smaller than the diameter value of the connecting rod.

[0015] Preferably, a seat is embedded in the nut groove, and the seat is composed of a pad and a limiting column. The pad is provided with a through hole, and the cross-section of the nut groove is a regular hexagon. The cross-sectional size of the pad is consistent with the cross-sectional size of the nut groove, and a limiting column hole is provided at the bottom of the nut groove. When the seat is actually installed, the pad is embedded in the nut groove, and the limiting column is embedded in the limiting column hole.

[0016] Preferably, a spring groove is provided on the limit column, a support spring and a self-locking rod are arranged in the spring groove, the self-locking rod and the support spring are fixedly glued, the inner end of the support spring is fixedly glued to the bottom of the spring groove, self-locking holes are provided on the inner side surfaces of the first positioning nut and the second positioning nut, the self-locking holes are evenly provided in a circle, and when the connecting rod, the first positioning nut and the second positioning nut are actually installed and the support spring is in a reset state, the end of the self-locking rod is inserted into the self-locking hole.

[0017] Preferably, a clearance groove is provided on the side of the spring groove, a connecting rod is integrally formed on the side of the self-locking rod, the connecting rod is movably arranged in the clearance groove, and a push rod is integrally formed on the outer end surface of the connecting rod, when the push rod is pushed inward, the push rod contacts the bottom of the clearance groove, and at this time, the self-locking rod is completely disengaged from the self-locking hole, and when the first positioning nut and the second positioning nut are screwed, there is no contact between the first positioning nut, the second positioning nut and the push rod.

[0018] Preferably, the end of the self-locking rod is chamfered.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Shield construction is carried out through a shield construction method of super-sharp curve and extremely shallow soil cover, which is composed of excavation face soil pressure monitoring, grouting management, slag discharge calculation and soil discharge management, test simulation construction, and shield curve excavation process. Inert filling materials are injected on the outside of the shield shell on the inner side of the turning curve to slowly correct the angle of the shield head, which plays a role in controlling the shield posture and avoiding excessive correction to cause greater disturbance to the stratum;

[0021] 2. A cushion seat composed of a pad and a limiting column is provided, a spring groove is opened on the limiting column, a supporting spring and a self-locking rod are provided in the spring groove, and a self-locking hole is opened on the inner side of the first positioning nut and the second positioning nut, so that the self-locking rod is embedded in the self-locking hole through the action of the supporting spring, thereby forming self-locking for the first positioning nut and the second positioning nut, thereby preventing the first positioning nut and the second positioning nut from loosening, thereby ensuring the connection stability between the segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection of the pipe segments of the present invention;

[0024] Figure 3 A half-section view of a tube segment of the present invention;

[0025] Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0026] Figure 5 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0027] Figure 6 This is a schematic diagram of the connecting rod structure of the present invention;

[0028] Figure 7This is a schematic diagram of the structure of the first positioning nut of the present invention;

[0029] Figure 8 A half-section view of a cushion seat of the present invention;

[0030] Fig. 9 It is a flow chart of the construction method of the present invention.

[0031] In the figure: the inner side of the turning curve 1, the shield cavity 2, the pipe segment 3, the connecting rod 4, the first positioning nut 5, the second positioning nut 6, the mounting hole 7, the nut slot 8, the threaded rod 9, the limit column hole 10, the cushion seat 11, the pad 12, the limit column 13, the through hole 14, the spring slot 15, the air avoidance slot 16, the support spring 17, the self-locking rod 18, the connecting rod 19, the push rod 20, and the self-locking hole 21. DETAILED DESCRIPTION

[0032] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.

[0036] See also Figure 1-9 The present invention provides the following three preferred embodiments:

[0037] Embodiment 1

[0038] A shield construction method for an ultra-sharp curve and extremely shallow earth covering includes monitoring of earth pressure on the excavation face, grouting management, calculation of slag discharge and management of earth discharge, test simulation construction, and shield curve excavation process. An earth pressure gauge is installed on the top of the front shield to monitor the earth pressure on the excavation face in real time. An injection hole is arranged on the top of the shield machine to inject a soil maintenance filler. The volume and weight of the slag carried by each slag truck are managed in the shallow earth covering section. During the excavation process, the loading height and weight of the slag truck are measured using a measuring device based on the cylinder stroke length corresponding to the earth volume of the slag truck. In order to better control the excavation parameters of the shield shallow earth covering construction, similar working conditions are simulated and test construction is carried out in the range of 1.5D to 2.0D. During the excavation process, ground staff monitor the stratum deformation of the excavation face section and the shield tail section of each ring in real time. The leading section and the subsequent section are measured before and after the excavation starts and ends. Inert filling material is injected into the outer side of the shield shell on the inner side 1 of the turning curve to slowly correct the shield head.

[0039] The soil maintenance filler is prepared from special clay, water, and plastic strength regulator, and the inert filling material is composed of: 35% bentonite, 21% inorganic powder, 18% superplasticizer, 0.4% water retaining agent, 0.8% antifreeze agent, and the balance is water.

[0040] The shield machine is equipped with two sets of synchronous grouting systems to fill the building gaps as quickly as possible, and is combined with high-molecular polymer additives and mineral-based additives. At the same time, the synchronous grouting liquid at the tail of the shield adopts a quick-setting ratio, and the setting time is controlled within 5s. Since the shallow overburden interval is a sand layer with a low fine-grained content, the use of high-molecular polymer additives, mineral-based additives and quick-setting ratios can ensure the plastic fluidity of soil and sand and avoid gushing during excavation. The shield construction is carried out through a super-sharp curve and extremely shallow overburden shield construction method composed of excavation face soil pressure monitoring, grouting management, slag discharge calculation and soil discharge management, experimental simulation construction, and shield curve excavation process. Inert filling material is injected on the outside of the shield shell on the inner side of the turning curve 1 to slowly correct the angle of the shield head, thereby controlling the shield posture and avoiding excessive correction to cause greater disturbance to the stratum.

[0041] Embodiment 2

[0042] On the basis of the first embodiment, a shield construction device for super-sharp curves and extremely shallow soil covering is provided. The shield construction device for super-sharp curves and extremely shallow soil covering is used to implement the shield construction method for super-sharp curves and extremely shallow soil covering. After the shield curve excavation process is carried out, a tunnel structure is formed by installing a pipe segment 3 in the shield cavity 2. Each side of the pipe segment 3 is provided with a mounting hole 7. A nut groove 8 is provided on the inner side of the pipe segment 3 at the port of the mounting hole 7. The adjacent pipe segments 3 are positioned and connected by a pipe segment positioning member during actual installation. The pipe segment positioning member is composed of a connecting rod 4, a first positioning nut 5 and a second positioning nut 6. The mounting hole 7 is an arc-shaped notch. The connecting rod 4 is an arc-shaped rod, and both ends of the connecting rod 4 are integrally formed with a threaded rod 9. The curvature value of the mounting hole 7 coincides with the curvature value of the connecting rod 4, and the diameter value of the threaded rod 9 is smaller than the diameter value of the connecting rod 4. A cushion seat 11 is embedded in the nut groove 8. The cushion seat 11 is composed of a pad 12 and a limiting column 13. A through hole 14 is provided on the pad 12. The cross-section of the nut groove 8 is a regular hexagon. The cross-sectional size of the pad 12 coincides with the cross-sectional size of the nut groove 8. A limiting column hole 10 is provided at the bottom of the nut groove 8. When the cushion seat 11 is actually installed, the pad 12 is embedded in the nut groove 8, and the limiting column 13 is embedded in the limiting column hole 10.

[0043] A spring slot 15 is provided on the limit column 13, a support spring 17 and a self-locking rod 18 are provided in the spring slot 15, the self-locking rod 18 and the support spring 17 are fixedly glued, the inner end of the support spring 17 is fixedly glued to the bottom of the spring slot 15, and a self-locking hole 21 is provided on the inner side of the first positioning nut 5 and the second positioning nut 6. The self-locking hole 21 is evenly provided with a circle, and when the connecting rod 4, the first positioning nut 5, and the second positioning nut 6 are actually installed, and when the support spring 17 is in the reset state, the end of the self-locking rod 18 is inserted into the self-locking hole 21, through A cushion seat 11 composed of a pad 12 and a limiting column 13 is provided, and a spring groove 15 is opened on the limiting column 13, and a support spring 17 and a self-locking rod 18 are arranged in the spring groove 15, and a self-locking hole 21 is opened on the inner side of the first positioning nut 5 and the second positioning nut 6, so that the self-locking rod 18 is embedded in the self-locking hole 21 through the action of the support spring 17, so that the first positioning nut 5 and the second positioning nut 6 are self-locked, thereby preventing the first positioning nut 5 and the second positioning nut 6 from loosening, thereby ensuring the connection stability between the pipe segments 3.

[0044] Embodiment 3

[0045] On the basis of the second embodiment, a clearance groove 16 is opened on the side of the spring groove 15, and a connecting rod 19 is integrally formed on the side of the self-locking rod 18. The connecting rod 19 is movably arranged in the clearance groove 16, and a push rod 20 is integrally formed on the outer end surface of the connecting rod 19. When the push rod 20 is pushed inward, the push rod 20 contacts the bottom of the clearance groove 16, and at this time, the self-locking rod 18 is completely disengaged from the self-locking hole 21, and when the first positioning nut 5 and the second positioning nut 6 are screwed, there is no contact between the first positioning nut 5 and the second positioning nut 6 and the push rod 20. By opening the clearance groove 16 and arranging the connecting rod 19 and the push rod 20 on the side of the self-locking rod 18, the first positioning nut 5 and the second positioning nut 6 can be screwed and installed by pushing the push rod 20.

[0046] The end of the self-locking rod 18 is chamfered to facilitate the self-locking rod 18 to be inserted into the self-locking hole 21 .

[0047] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A shield construction method for ultra-sharp curves and extremely shallow soil cover, characterized by: The construction method includes: Excavation surface soil pressure monitoring, by installing an earth pressure gauge on the top of the front shield to monitor the excavation surface soil pressure in real time; Grouting management, by configuring injection holes on the top of the shield machine to inject soil maintenance filler; Calculate the discharge volume and manage the soil discharge. In the shallow covering area, manage the volume and weight of the soil carried by each muck truck. During the excavation process, use measuring equipment to measure the loading height and weight of the muck truck based on the cylinder stroke length corresponding to the earthwork volume of the muck truck. Test simulation construction, in order to better control the excavation parameters of shield shallow cover construction, simulate similar working conditions, and conduct test construction in the range of 1.5D to 2.0D. During the excavation process, ground staff monitor the stratum deformation of the excavation face section and shield tail section of each ring in real time; measure the leading section and the following section before and after the excavation starts; During the shield curve excavation process, inert filling material is injected into the outer side of the shield shell on the inner side of the turning curve (1) to slowly correct the shield head.

2. The shield construction method for super-sharp curve and extremely shallow soil cover according to claim 1, characterized in that: The soil maintenance filler is prepared from special clay, water and plastic strength regulator, and the inert filling material is composed of: 25-40% bentonite, 18-25% inorganic powder, 12-22% superplasticizer, 0.2-0.5% water retainer, 0.5-1.0% antifreeze agent, and the balance is water.

3. The shield construction method for super-sharp curve and extremely shallow soil cover according to claim 1, characterized in that: The shield machine is equipped with two sets of synchronous grouting systems to fill the building gaps as quickly as possible, and uses a combination of polymer additives and mineral-based additives. At the same time, the synchronous grouting liquid at the tail of the shield adopts a quick-setting ratio, and the setting time is controlled within 5s. Since the shallow overburden area is a sand layer with a low fine-grained content, the use of polymer additives, mineral-based additives and quick-setting ratios can ensure the plastic fluidity of soil and sand and avoid gushing during excavation.

4. A shield construction device for super-sharp curve and extremely shallow soil cover as claimed in any one of claims 1 to 3, characterized in that: After the shield curve excavation process is carried out, a tunnel structure is formed by installing a pipe segment (3) in the shield cavity (2), each side of the pipe segment (3) is provided with a mounting hole (7), the inner side surface of the pipe segment (3) is provided with a nut groove (8) at the end of the mounting hole (7), and adjacent pipe segments (3) are positioned and connected by a pipe segment positioning member during actual installation, and the pipe segment positioning member is composed of a connecting rod (4), a first positioning nut (5) and a second positioning nut (6).

5. The shield construction device for super-sharp curve and extremely shallow soil cover according to claim 4, characterized in that: The mounting hole (7) is an arc-shaped notch, the connecting rod (4) is an arc-shaped rod, and threaded rods (9) are integrally formed at both ends of the connecting rod (4), the curvature value of the mounting hole (7) matches the curvature value of the connecting rod (4), and the diameter value of the threaded rod (9) is smaller than the diameter value of the connecting rod (4).

6. The shield construction device for super-sharp curve and extremely shallow soil cover according to claim 5, characterized in that: A cushion seat (11) is embedded in the nut groove (8), and the cushion seat (11) is composed of a pad (12) and a limiting column (13). A through hole (14) is provided on the pad (12). The cross section of the nut groove (8) is a regular hexagon. The cross section size of the pad (12) matches the cross section size of the nut groove (8). A limiting column hole (10) is provided at the bottom of the nut groove (8). When the cushion seat (11) is actually installed, the pad (12) is embedded in the nut groove (8), and the limiting column (13) is embedded in the limiting column hole (10).

7. The shield construction device for super-sharp curve and extremely shallow soil cover according to claim 6, characterized in that: The limiting column (13) is provided with a spring groove (15), and a support spring (17) and a self-locking rod (18) are arranged in the spring groove (15). The self-locking rod (18) and the support spring (17) are fixedly glued, and the inner side end of the support spring (17) is fixedly glued to the bottom of the spring groove (15). The inner side surfaces of the first positioning nut (5) and the second positioning nut (6) are provided with self-locking holes (21), and the self-locking holes (21) are evenly arranged in a circle. When the connecting rod (4), the first positioning nut (5) and the second positioning nut (6) are actually installed and the support spring (17) is in a reset state, the end of the self-locking rod (18) is inserted into the self-locking hole (21).

8. The shield construction device for super-sharp curve and extremely shallow soil cover according to claim 7, characterized in that: The side of the spring groove (15) is provided with an escape groove (16), and the side of the self-locking rod (18) is integrally formed with a connecting rod (19), the connecting rod (19) is movably arranged in the escape groove (16), and the outer end surface of the connecting rod (19) is integrally formed with a push rod (20), when the push rod (20) is pushed inward, the push rod (20) contacts the bottom of the escape groove (16), and at this time, the self-locking rod (18) is completely disengaged from the self-locking hole (21), and when the first positioning nut (5) and the second positioning nut (6) are screwed, there is no contact between the first positioning nut (5), the second positioning nut (6) and the push rod (20).

9. The shield construction device for super-sharp curve and extremely shallow soil cover according to claim 8, characterized in that: The end of the self-locking rod (18) is chamfered.

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