Reaction frame structure of shield starting shaft

Abstract

The present invention provides a reaction frame structure for a shield starting shaft, which belongs to the technical field of shield reaction frames and includes a plurality of anchor rods, two connecting columns and a support seat. The plurality of anchor rods are used to be anchored into the stratum on one side of the starting shaft, and the anchoring direction of the plurality of anchor rods is arranged in the same direction as the jacking direction of the jacking pipe. The two connecting columns are used to be installed on both sides of the bottom of the starting shaft, and a steel mesh is arranged in the connecting columns. Concrete for fixing the steel mesh and the plurality of anchor rods is poured in the connecting columns. The support seat is located between the two connecting columns, and the two sides of the reaction frame are respectively connected and fixed to the two connecting columns. The reaction frame is used to provide a reaction force for the jacking of the jacking pipe with the help of the plurality of anchor rods. The plurality of anchor rods anchored in the reaction frame structure for the shield starting shaft provided by the present invention can not only reinforce the stratum on one side of the starting shaft, but also provide the reaction force provided by the reaction frame to the shield machine, thereby reducing the space volume required for the reaction frame, not only ensuring the safety of construction, but also reducing the cost investment.

Description

Technical Field

[0001] The invention belongs to the technical field of shield reaction frames, and more specifically, relates to a reaction frame structure of a shield launching shaft. Background Art

[0002] During shield tunneling, a reaction frame is an indispensable device that provides counterforce to the shield machine during its initial launch. Its strength and rigidity are directly related to the smooth launch of the shield machine. However, existing reaction frame structures typically include multiple support ribs at the rear, which increases the excavation required for the launch shaft. Furthermore, the increased size of the launch shaft requires reinforcement of the surrounding geology to prevent landslides and other problems. Consequently, existing reaction frame construction methods are labor-intensive and costly. Summary of the Invention

[0003] The purpose of the present invention is to provide a reaction frame structure for a shield launching shaft, aiming to solve the problem of large engineering workload and high construction cost in building a reaction frame in the launching shaft.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a shield launching shaft reaction frame structure, comprising:

[0005] A plurality of anchor rods are used for anchoring into the stratum on one side of the starting well, and the anchoring direction of the plurality of anchor rods is arranged in the same direction as the jacking direction of the jacking pipe;

[0006] Two connecting columns are installed on both sides of the bottom of the starting shaft. A steel mesh is provided in the connecting columns, and the steel mesh is used to be welded and fixed to the multiple anchor rods on the same side. Concrete for fixing the steel mesh and the multiple anchor rods is poured in the connecting columns.

[0007] The support seat is located between the two connecting columns. A reaction frame is placed on the support seat. The two sides of the reaction frame are respectively connected and fixed to the two connecting columns. The reaction frame uses a plurality of anchor rods to provide reaction force for the jacking of the jacking pipe.

[0008] As another embodiment of the present application, the plurality of anchor rods are parallel to each other and arranged in a horizontally spaced manner from top to bottom.

[0009] As another embodiment of the present application, a connecting plate is fixed to the bottom of the steel mesh, and the connecting plate is used for installation on the starting well.

[0010] As another embodiment of the present application, a reinforcing rib is connected between the tops of the two connecting columns. The reinforcing rib is an I-beam, and both ends of the I-beam are respectively welded and fixed to the two steel meshes.

[0011] As another embodiment of the present application, tension plates are fixed to the ends of a plurality of anchor rods located on one side of the launching well, and the tension plates are vertically arranged inside the connecting column.

[0012] As another embodiment of the present application, a plurality of avoidance grooves for avoiding the plurality of anchor rods are provided on both sides of the reaction frame; a avoidance groove for giving way to the I-beam is provided on the top of the reaction frame.

[0013] As another embodiment of the present application, a plurality of reinforcement blocks are provided on the side of the connecting column, and the plurality of reinforcement blocks are used to abut against the side wall of the starting well.

[0014] As another embodiment of the present application, the two reinforcement blocks extend toward each other, and the connecting column and the reinforcement block cooperate to clamp the reaction frame.

[0015] As another embodiment of the present application, a fastening rod is connected between the connecting column and the reaction frame, and the fastening rod passes through the connecting column and the reaction frame in sequence.

[0016] As another embodiment of the present application, the anchor rod is provided with a reinforcement sleeve on the outer peripheral surface of the starting shaft, one end of the reinforcement sleeve is used to be fixed on the side wall of the starting shaft, and the other end is used to be welded and fixed to the steel mesh.

[0017] The beneficial effect of the shield launching shaft reaction frame structure provided by the present invention is that, compared with the prior art, in the shield launching shaft reaction frame structure of the present invention, multiple anchor rods are anchored on one side of the launching shaft, and the anchor rods are anchored in the stratum. Two connecting columns are installed on both sides of the bottom of the launching shaft. The steel mesh in the connecting columns is welded and fixed to the multiple anchor rods, and the reliable connection between the steel mesh and the anchor rods is ensured by pouring concrete. A support seat is provided between the two connecting columns, and a reaction frame is placed on the support seat. At the same time, the reaction frame is respectively connected and fixed to the two connecting columns.

[0018] When in use, by anchoring multiple anchor rods into the stratum on one side of the starting well, during the jacking construction process, the shield machine will generate a force on the reaction frame, and the force of the reaction frame will act on the two connecting columns. Since the anchoring direction of the multiple anchor rods is set in the same direction as the jacking direction of the jacking, the connecting column can remain stable relative to the starting well under the action of the multiple anchor rods. The support seat is used to support the reaction frame, avoiding the anchor rods from bearing the force of deviation and ensuring that they can be stable in the stratum. In this application, the multiple anchor rods anchored can not only reinforce the stratum on one side of the starting well, but also provide a reaction force for the jacking of the jacking. Compared with setting multiple support ribs on one side of the reaction frame, the space volume required for the reaction frame is reduced, which not only ensures the safety of construction, but also reduces the cost investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a reaction frame structure of a shield launching shaft is provided for an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the connection between the reaction frame and the connecting column provided in the second embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the connection between an I-beam and a connecting column provided in the second embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the connection between the support base and the reaction frame provided in the third embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection between the anchor rod and the reinforcement sleeve provided in the fourth embodiment of the present invention.

[0025] In the figure: 1. Starting shaft; 2. Connecting column; 3. Anchor rod; 4. Tension plate; 5. Reaction frame; 6. Reinforcement block; 7. I-beam; 8. Make way groove; 9. Avoidance groove; 10. Connecting plate; 11. Support seat; 12. Connecting rib; 13. Fixing plate; 14. Steel mesh; 15. Connecting seat; 16. Reinforcement sleeve. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] See also Figure 1 and Figure 3 and Figure 4, the reaction frame structure of the shield starting shaft provided by the present invention is now described. The reaction frame structure of the shield starting shaft includes a plurality of anchor rods 3, two connecting columns 2 and a support seat 11. The plurality of anchor rods 3 are used to anchor into the stratum on one side of the starting shaft 1, and the anchoring direction of the plurality of anchor rods 3 is set in the same direction as the jacking direction of the jacking pipe. The two connecting columns 2 are used to be installed on both sides of the bottom of the starting shaft 1. A steel mesh 14 is provided in the connecting column 2. The steel mesh 14 is used to be welded and fixed with the plurality of anchor rods 3 on the same side; concrete for fixing the steel mesh 14 and the plurality of anchor rods 3 is poured in the connecting column 2. The support seat 11 is located between the two connecting columns 2, and a reaction frame 5 is placed on the support seat 11. The two sides of the reaction frame 5 are respectively connected and fixed to the two connecting columns 2. The reaction frame 5 is used to provide a reaction force to the jacking of the jacking pipe with the help of a plurality of anchor rods 3.

[0028] The beneficial effect of the reaction frame structure of the shield starting shaft provided by the present invention is that, compared with the prior art, in the reaction frame structure of the shield starting shaft of the present invention, multiple anchor rods 3 are anchored on one side of the starting shaft 1, and the anchor rods 3 are anchored in the stratum. Two connecting columns 2 are installed on both sides of the bottom of the starting shaft 1. The steel mesh 14 in the connecting column 2 is welded and fixed to the multiple anchor rods 3, and the reliable connection between the steel mesh 14 and the anchor rods 3 is ensured by pouring concrete. A support seat 11 is provided between the two connecting columns 2, and a reaction frame 5 is placed on the support seat 11. At the same time, the reaction frame 5 is respectively connected and fixed to the two connecting columns 2.

[0029] When in use, by anchoring multiple anchor rods 3 into the stratum on one side of the starting well 1, during the jacking construction process, the shield machine will generate a force on the reaction frame 5, and the force of the reaction frame 5 will act on the two connecting columns 2. Since the anchoring direction of the multiple anchor rods 3 is set in the same direction as the jacking direction of the jacking, the connecting column 2 can remain stable relative to the starting well 1 under the action of the multiple anchor rods 3. The support seat 11 is used to support the reaction frame 5, avoiding the anchor rod 3 from bearing the force of deviation and ensuring that it can be stable in the stratum. In the present application, the multiple anchor rods 3 anchored can not only reinforce the stratum on one side of the starting well 1, but also provide a reaction force for the jacking of the jacking. Compared with setting multiple support ribs on one side of the reaction frame 5, the space volume required for the reaction frame 5 is reduced, which not only ensures the safety of construction, but also reduces the cost investment.

[0030] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 2, multiple anchor rods 3 are parallel to each other and arranged in a horizontal and spaced arrangement from top to bottom. First, the two sides of the starting well 1 are respectively the completed section that has been jacked in and the unfinished section that has not been jacked in. In order to facilitate the installation of the equipment, the length and width of the starting well 1 are usually larger than the inner diameter of the completed section that has been jacked in. Since there are many unknown factors in the strata of the unfinished section, the strata at that location need to be reinforced during the jacking construction, especially for areas prone to landslides such as sand and gravel. In order to avoid damage to the side wall of the starting well 1 and cause landslides, multiple anchor rods 3 are anchored in the unconstructed section, and the multiple anchor rods 3 are arranged in a horizontal and spaced arrangement from top to bottom. The multiple anchor rods 3 are distributed on both sides of the central axis of the starting well 1, and the multiple anchor rods 3 are arranged parallel to each other, thereby improving the safety of the starting well 1. The set anchor rods 3 can reduce the cost investment required to reinforce the surrounding strata on the original basis, thereby improving the efficiency of construction.

[0031] To prevent anchor rods 3 from experiencing forces deviating from their own axes, they must be arranged parallel to the axis of the jacking pipe. Furthermore, the anchor rods 3 in this application are expanded anchor rods 3, with the expanded ends of the anchor rods 3 located within the formation and the top ends of the anchor rods 3 located within the launch well 1. Furthermore, the direction from the expanded ends to the top ends of the anchor rods 3 is parallel to and opposite to the direction of jacking pipe advancement. Consequently, the presence of multiple anchor rods 3 ensures that the reaction frame 5 remains relatively stable.

[0032] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 2 、 Figure 3 and Figure 4 , a connecting plate 10 is fixed to the bottom of the steel mesh 14, and the connecting plate 10 is used to be installed on the starting shaft 1. There are two connecting columns 2, and the two connecting columns 2 are arranged in parallel. The connecting column 2 is a concrete component with a steel mesh 14 inside. The steel mesh 14 is placed in the formwork, and then concrete is poured into the formwork. After the concrete is solidified and formed, the connecting column 2 is formed. In order to improve the connection strength between the connecting column 2 and the anchor rod 3 and ensure the stability of the connection between the connecting column 2 and the anchor rod 3, the end of the anchor rod 3 can be welded and fixed to the steel mesh 14 before pouring the concrete, and then poured together to form an integrated structure.

[0033] Both connecting columns 2 are installed at the bottom of the starting shaft 1. In order to facilitate connection and improve the connection force between the connecting columns 2 and the starting shaft 1, a connecting plate 10 can be welded and fixed at the bottom of the steel mesh 14. After being welded and fixed to the steel mesh 14 and cast into shape, the connecting plate 10 can form a unified whole, thereby improving the connection strength between the entire connecting column 2 and the starting shaft 1. During the actual installation process, multiple bolts can be pre-embedded or multiple expansion bolts can be fixed in the starting shaft 1. The connecting plate 10 is connected and fixed with multiple pre-embedded bolts or multiple expansion bolts.

[0034] In order to improve the connection strength between the connecting plate 10 and the connecting column 2, first, the connecting plate 10 is located at the bottom of the connecting column 2, and a plurality of connecting ribs 12 are fixed on the connecting plate 10. The plurality of connecting ribs 12 are arranged along the length direction of the connecting column 2. A fixing plate 13 is provided on the top of the connecting column 2. The fixing plate 13 is connected and fixed to the plurality of connecting ribs 12. A stable connection structure is formed by the connecting plate 10, the plurality of connecting ribs 12 and the fixing plate 13, which avoids the problem of deviating from the vertical direction when the connecting column 2 is subjected to a large force, resulting in the problem of failure of the connection between the connecting plate 10 and the connecting column 2. In addition, the connecting ribs 12 are welded and fixed to the welding mesh, thereby improving the strength of the entire connecting column 2.

[0035] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figures 1 to 5 , a reinforcing rib is connected between the tops of the two connecting columns 2, and the reinforcing rib is an I-beam 7. The two ends of the I-beam 7 are welded and fixed to two steel meshes 14 respectively. The two connecting columns 2 are parallel to each other and spaced apart. In order to improve the connection strength between the two connecting columns 2 and ensure the stability of their position relative to the starting well 1, an I-beam 7 is connected and fixed to the top of the two connecting columns 2. The connection strength of the I-beam 7 is high and it is easy to obtain and process. In order to improve the connection strength between the I-beam 7 and the two connecting columns 2. The I-beam 7 is welded and fixed to the steel mesh 14 in the connecting column 2. When the steel mesh 14 is cast, it is cast together with the I-beam 7.

[0036] Since the effective area of the connection between the steel mesh 14 and the I-beam 7 is relatively low, even if they are poured together, there is still a problem of unreliable connection due to the low strength of the concrete. For this reason, multiple positioning rods can be fixed on the bottom surface of the I-beam 7, and the positioning rods abut against the outside of the steel mesh 14. After pouring and forming, the positioning rods are buried inside the concrete together with the steel mesh 14, and the positioning rods are fixed on the I-beam 7, which ultimately improves the overall connection strength.

[0037] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 1 , the ends of the multiple anchor rods 3 located on one side of the starting well 1 are fixed with tension plates 4, and the tension plates 4 are vertically arranged inside the connecting column 2. In order to further improve the connection stability of the multiple anchor rods 3 and the connecting column 2, and avoid the slippage of the anchor rods 3 and the steel mesh 14 on the connecting column 2. The ends of the multiple anchor rods 3 located on one side of the starting well 1 are all connected with tension plates 4, and the multiple tension plates 4 are cast in the connecting column 2 together with the steel mesh 14. After the concrete is solidified and formed, the tension plates 4 can be stably fixed in the connecting column 2. At the same time, due to the provision of the tension plates 4, the multiple anchor rods 3 can act on the connecting column 2 at the same time, ensuring that the forces exerted by the multiple anchor rods 3 on the connecting column 2 remain relatively equal, thereby ensuring normal operation.

[0038] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 2 and Figure 4 The reaction frame 5 has multiple escape grooves 9 on both sides for accommodating multiple anchor rods 3; the top of the reaction frame 5 has an escape groove 8 for accommodating the I-beam 7. The escape grooves 9 are provided on both sides of the reaction frame 5 for installing the reaction frame 5 after connecting the anchor rods 3. The escape grooves 8 are provided on the top of the reaction frame 5 to improve the integration level of the device.

[0039] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 1 and Figure 5 , a plurality of reinforcing blocks 6 are provided on the side of the connecting column 2, and the plurality of reinforcing blocks 6 are used to lean against the side wall of the starting well 1. In order to avoid the problem that the connecting column 2 cannot be stably supported by only a plurality of anchor rods 3, a plurality of reinforcing blocks 6 are provided on a side of the connecting column 2 away from the plurality of anchor rods 3. The reinforcing blocks 6 can be prefabricated components, rigid metal blocks, or prefabricated concrete blocks. The reinforcing blocks 6 can be cast together with the connecting column 2. One side of the reinforcing block 6 leans against the inner wall of the starting well 1, and the other side is fixed to the side of the connecting column 2. By providing a plurality of reinforcing blocks 6, the ability of the connecting column 2 to withstand the force along the jacking direction of the jacking pipe is improved, thereby ensuring the service life of the connecting column 2.

[0040] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 1 and Figure 5 , two reinforcing blocks 6 extend toward each other, and the connecting column 2 and the reinforcing blocks 6 cooperate to clamp the reaction frame 5. In order to stably clamp the reaction frame 5 and enable the reaction frame 5 to stably withstand the force of the shield machine during operation, first, the reinforcing block 6 is set between the connecting column 2 and the side wall of the starting shaft 1, and the two relative reinforcing blocks 6 extend toward each other. The reinforcing block 6 extends to the outside of the connecting column 2, so that a side of the reinforcing block 6 close to the anchor rod 3 and a side of the connecting column 2 close to the reinforcing block 6 form a clamping groove, and the reaction frame 5 is clamped and matched with the clamping groove. By setting the reinforcing block 6, the reaction frame 5 not only bears the force of the connecting column 2, but also the force of the reinforcing block 6, that is, the reinforcing block 6 and the connecting column 2 are used together to support and stabilize the reaction frame 5, ensuring the reliability of the connection and avoiding the anchor rod 3 from being damaged.

[0041] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 4A fastening rod is connected between the connecting column 2 and the reaction frame 5, and the fastening rod passes through the connecting column 2 and the reaction frame 5 in sequence. In this application, in order to avoid failure of the connection between the reaction frame 5 and the connecting column 2 and the reinforcement block 6, through holes are opened on the reaction frame 5 and the connecting column 2. By passing the fastening rod through the two through holes, the reaction frame 5 and the connecting column 2 are prevented from being separated, thereby ensuring safety.

[0042] As a specific embodiment of the shield starting shaft reaction frame structure provided by the present invention, please refer to Figure 5 The outer circumference of the anchor rod 3 located in the starting well 1 is covered with a reinforcement sleeve 16. One end of the reinforcement sleeve 16 is used to be fixed to the side wall of the starting well 1, and the other end is used to be welded and fixed to the steel mesh 14. Since the anchor rod 3 has a small diameter, although the number of anchor rods 3 provided in this application is multiple, since the anchor rod 3 is a standard part, the increase in the diameter of the anchor rod 3 will greatly increase the difficulty of anchoring the anchor rod 3, and at the same time, it places higher requirements on the drilling rig, etc. For this reason, the reinforcement sleeve 16 can be covered on the anchor rod 3 located at the starting well. One end of the reinforcement sleeve 16 can be connected and fixed to the connecting column 2, and the other end can be connected and fixed to the side wall of the starting well opposite the connecting column 2. A connecting seat 15 is connected to the end of the reinforcement sleeve 16 away from the connecting column 2. The connecting seat 15 is welded and fixed to the end of the reinforcement sleeve 16 and is respectively connected to the side wall of the starting well 1 by bolts. Due to the provision of the reinforcement sleeve 16, the force applied by the connecting column 2 on the anchor rod 3 can be shared, so that the connecting column 2 is supported and stabilized by the reinforcement sleeve 16 and the anchor rod 3. In the present application, when the reinforcement sleeve 16 is provided, the stability of the connecting column 2 can be greatly improved, the size of the excavation required for the starting well 1 can be reduced, the project cost can be reduced, and the construction efficiency can be improved.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The reaction frame structure of the shield starting shaft is characterized by: include: A plurality of anchor rods are used for anchoring into the stratum on one side of the starting well, and the anchoring direction of the plurality of anchor rods is arranged in the same direction as the jacking direction of the jacking pipe; Two connecting columns are installed on both sides of the bottom of the starting shaft. A steel mesh is provided in the connecting columns, and the steel mesh is used to be welded and fixed to the multiple anchor rods on the same side. Concrete for fixing the steel mesh and the multiple anchor rods is poured in the connecting columns. A support seat is located between the two connecting columns, and a reaction frame is placed on the support seat. The two sides of the reaction frame are respectively connected and fixed to the two connecting columns. The reaction frame is used to provide a reaction force for the jacking of the jacking pipe by means of a plurality of anchor rods; A plurality of reinforcement blocks are provided on the side of the connecting column, and the plurality of reinforcement blocks are used to abut against the side wall of the starting well; The two reinforcement blocks extend toward each other, and the connecting column and the reinforcement block cooperate to clamp the reaction frame; A fastening rod is connected between the connecting column and the reaction frame, and the fastening rod passes through the connecting column and the reaction frame in sequence.

2. The shield launching shaft reaction frame structure according to claim 1, characterized in that: The plurality of anchor rods are parallel to each other and arranged at intervals in a transverse direction from top to bottom.

3. The shield launching shaft reaction frame structure according to claim 1, characterized in that: A connecting plate is fixed to the bottom of the steel mesh, and the connecting plate is used for being installed on the starting well.

4. The shield launching shaft reaction frame structure according to claim 1, characterized in that: A reinforcing rib is connected between the tops of the two connecting columns. The reinforcing rib is an I-beam, and both ends of the I-beam are respectively welded and fixed to the two steel meshes.

5. The shield launching shaft reaction frame structure according to claim 1, characterized in that: Tension plates are fixed to the ends of a plurality of anchor rods located on one side of the launching well, and the tension plates are vertically arranged inside the connecting column.

6. The shield launching shaft reaction frame structure according to claim 4, characterized in that: A plurality of avoidance grooves for avoiding the plurality of anchor rods are provided on both sides of the reaction frame; and a give-away groove for giving way to the I-beam is provided on the top of the reaction frame.

7. The shield launching shaft reaction frame structure according to claim 1, characterized in that: The anchor rod is located on the outer peripheral surface of the starting shaft and is sheathed with a reinforcement sleeve. One end of the reinforcement sleeve is used to be fixed on the side wall of the starting shaft, and the other end is used to be welded and fixed to the steel mesh.

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