Prestress pipe jacking device

Abstract

The invention provides a prestressed pipe jacking device which comprises a steel sleeve and a plurality of steel sleeves, the steel sleeve comprises a plurality of transverse steel sleeves and a plurality of vertical steel sleeves, each transverse steel sleeve comprises a plurality of pipe joints, the transverse steel sleeves are arranged in parallel, and the vertical steel sleeves are perpendicular to the transverse steel sleeves; the counter-force base is fixed on the ground, and the counter-force base is connected with the transverse steel sleeve and the vertical steel sleeve; and the connecting mechanism is connected with the plurality of pipe joints, and is used for connecting the pipe joints with the counter-force base. The connecting mechanism comprises a steel strand, and the bending resistance of the pipe jacking structure is improved by applying prestress to the steel strand. The prestressed steel strand and the steel sleeve are connected into a whole through the steel plate component, the dead weight of the whole structure is reduced, concrete is prevented from being pulled and cracked, the bending resistance is further improved, and the longer pipe jacking length can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering construction, and more specifically to a prestressed pipe jacking device. Background Art

[0002] As an advanced trenchless technology, the pipe curtain method has been widely used in large-scale underground engineering construction. This method first digs the departure shaft and working shaft at both ends of the underground structure, and then uses the jacking prefabricated components to form a circular curtain structure to effectively bear the load of the surrounding soil layer and provide a water-stopping effect. Compared with the traditional open-cut method and covered-cut method, the pipe curtain method is a type of dark-cut method. With its unique advantages, it has gradually become an ideal choice for solving underground engineering construction under complex conditions such as shallow cover, dense buildings, and existing lines.

[0003] The wide application of the pipe-curtain method is due to its strong adaptability, and it has good adaptability to various soil layers. After decades of technological development and actual engineering practice, the pipe-curtain method has derived a variety of construction methods, such as ESA method, FJ method, RBJ method, R&C method and NTR method. These methods have shown excellent performance in different engineering scenarios, especially in areas with large changes in the strata, dense buildings on the upper part, and where traditional excavation methods are not suitable. The construction of the pipe-curtain method has relatively little impact on the surrounding environment and buildings, making it an advanced and reliable choice in underground engineering construction.

[0004] In actual engineering, pipe jacking structures may face challenges when subjected to bending stress caused by underground soil or other external loads. This may have a negative impact on its overall bending resistance, especially for prestressed pipe jacking with a longer length. Otherwise, this may affect the overall bearing capacity of the pipe jacking structure. Therefore, it is necessary to develop a new type of prestressed pipe jacking device, which aims to improve its bending resistance and enable longer pipe jacking lengths. Summary of the invention

[0005] The present invention provides a prestressed pipe jacking device, which aims to solve the problem that the pipe jacking structure is difficult to withstand the bending stress caused by underground soil or other external loads, improve the bending bearing capacity of the pipe jacking, and achieve a longer pipe jacking length.

[0006] To achieve the above object, the present invention provides a prestressed pipe jacking device, comprising:

[0007] A steel sleeve, wherein the steel sleeve comprises a plurality of transverse steel sleeves and a plurality of vertical steel sleeves, wherein the transverse steel sleeve comprises a plurality of pipe sections, wherein the plurality of transverse steel sleeves are arranged in parallel, and the vertical steel sleeve is arranged perpendicular to the transverse steel sleeve;

[0008] A reaction base, the reaction base is fixed on the ground, and the reaction base is connected to the horizontal steel sleeve and the vertical steel sleeve;

[0009] A connecting mechanism is connected to the plurality of pipe sections and connects the pipe sections to the reaction force base.

[0010] In one embodiment, the connection mechanism includes a steel plate member, a bracket and a steel strand;

[0011] The steel plate member is arranged inside the transverse steel sleeve, and the steel plate member is connected to the pipe section;

[0012] The bracket is connected to the steel plate component and the pipe joint to fix the steel plate component and the pipe joint;

[0013] The steel strand is provided with two strands, and the steel strand is connected to the steel plate component, the transverse steel sleeve and the reaction base.

[0014] In one embodiment, the steel plate member is provided with a plurality of equidistant circular holes, and the steel strands are placed inside the steel sleeve and pass through the circular holes.

[0015] In one embodiment, the steel plate component is placed at the midpoint of each pipe section of the transverse steel sleeve, the top of the steel plate component is inscribed in the transverse steel sleeve, and the bottom is placed on the horizontal center line of the transverse steel sleeve.

[0016] In one embodiment, the steel plate component is configured with a plurality of brackets, and the brackets on one surface of the steel plate component are symmetrically distributed about the vertical center line of the surface, and the brackets are at 45° with the vertical direction.

[0017] In one embodiment, a positioning portion is provided in the middle of the transverse steel sleeve, the positioning portion is connected to the vertical steel sleeve, the positioning portion is made of aluminum alloy material, and a reflective mark is provided on the surface of the positioning portion to facilitate subsequent positioning, deviation correction and drilling.

[0018] In one embodiment, the connection between the positioning portion and the transverse steel sleeve is welding, and the diameter of the positioning portion is greater than the sum of the diameters of the two steel strands.

[0019] In one embodiment, anchors are provided at both ends of the transverse steel sleeve, and the anchors include an anchor head and an anchor plate, and the diameter of the anchor plate is larger than the transverse steel sleeve.

[0020] In one embodiment, one end of the single-strand steel strand is fixed to the anchor, and the other end passes through the transverse steel sleeve and the vertical steel sleeve in sequence, and then is fixed to the reaction base.

[0021] In one embodiment, the length of a single pipe section of the transverse steel sleeve is no more than 12 m, the inner diameter is 1.8 m, and the wall thickness is 20 mm.

[0022] The present invention has the following beneficial effects:

[0023] 1. Improve the bending resistance: In the present invention, prestressed steel strands are arranged in the jacking pipe, and the bending resistance of the jacking pipe structure is improved by applying prestress to the steel strands.

[0024] 2. Reduce its own weight: The interior of the jacking pipe of the present invention is not filled with concrete, but a steel plate component is used to connect the prestressed steel strand and the steel sleeve into a whole, thereby reducing the dead weight of the structure.

[0025] 3. Not easy to deform: The bending moment characteristic of the steel strand in the jacking pipe in the present invention is approximately a linear bending moment envelope diagram. The bending of the steel strand can reduce the degree of anti-arching produced by the jacking pipe structure, which is beneficial to the long-term deformation control of the structure.

[0026] 4. Improve vertical rigidity: The present invention bends the steel strands in the middle of the jacking tunnel and anchors them on the reaction base on the ground surface, thereby reducing the deflection of the middle of the tunnel under the action of the upper load and improving the vertical rigidity of the jacking tunnel.

[0027] 5. Extending the length of the jacking pipe structure: The present invention improves the bending resistance and vertical rigidity, so that the jacking pipe structure can have a longer length, thereby improving the applicability of the pipe curtain method in long-distance dark excavation projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the transverse structure of a prestressed pipe jacking device according to an embodiment of the present invention;

[0029] Figure 2 It is a partially enlarged longitudinal structural schematic diagram of a prestressed pipe jacking device according to an embodiment of the present invention.

[0030] Among them, 1 is a horizontal steel sleeve; 2 is a steel strand; 3 is a steel plate component; 4 is a bracket; 5 is an anchor; 6 is a reaction base; 7 is a vertical steel sleeve; 8 is a reinforcement area; and 9 is a positioning part. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] Figure 1 This is a schematic diagram of the transverse structure of a prestressed pipe jacking device according to an embodiment of the present invention, wherein the prestressed pipe jacking device comprises:

[0033] Steel sleeves, the steel sleeves comprising a plurality of transverse steel sleeves 1 and a plurality of vertical steel sleeves 7, the transverse steel sleeves 1 comprising a plurality of pipe sections, the plurality of transverse steel sleeves 1 being placed in parallel, and the vertical steel sleeves 7 being arranged perpendicular to the transverse steel sleeves 1;

[0034] A reaction base 6, wherein the reaction base 6 is fixed on the ground and connected to the horizontal steel sleeve 1 and the vertical steel sleeve 7;

[0035] A connecting mechanism is connected to the plurality of pipe sections, and connects the pipe sections to the reaction force base 6 .

[0036] Specifically, a plurality of transverse steel sleeves 1 are located on the top of the pipe-roof mechanism, which can provide better flexibility resistance and overall stability for underground projects and improve the adaptability of the overall structure.

[0037] In one embodiment, the connection mechanism includes a steel plate member 3, a bracket 4 and a steel strand 2;

[0038] The steel plate member 3 is arranged inside the transverse steel sleeve 1, and the steel plate member 3 is connected to the pipe segment;

[0039] The bracket 4 is connected to the steel plate member 3 and the pipe joint to fix the steel plate member 3 and the pipe joint;

[0040] The steel strand 2 is provided with two strands, and the steel strand 2 is connected to the steel plate member 3 , the transverse steel sleeve 1 and the reaction base 6 .

[0041] Specifically, Figure 2 As shown, the transverse steel sleeve 1 at the upper end of the rectangle is provided with a steel plate member 3. The midpoint of the transverse steel sleeve 1 at the upper end of the rectangle is provided with a vertical steel sleeve.

[0042] In one embodiment, the steel plate member 3 is provided with a plurality of equidistant circular holes, and the steel strand 2 is placed inside the steel sleeve and passes through the circular holes to fix the position of the steel strand.

[0043] Specifically, the specific position and spacing of the circular holes should be determined according to the bending moment envelope of the jacking pipe, and the diameter of the circular holes should be determined according to the diameter of the steel strand 2 actually used.

[0044] In one embodiment, the steel plate component 3 is placed at the midpoint of each pipe section of the transverse steel sleeve, the top of the steel plate component 3 is inscribed in the transverse steel sleeve 1 , and the bottom is placed on the horizontal center line of the transverse steel sleeve 1 .

[0045] Specifically, the arrangement of the steel plate member 3 in the middle of the pipe section can effectively improve the strength and stability of the overall structure. This configuration can form a more uniform support and reinforcement in the middle of the pipeline, reducing the deformation and deflection of the structure when subjected to stress.

[0046] The steel plate component is configured with a plurality of brackets, and the brackets on one surface of the steel plate component are symmetrically distributed about the vertical center line of the surface, and the brackets are at 45° with the vertical direction.

[0047] Specifically, the bracket 4 is located on two surfaces of the steel plate, and the bracket 4 is connected to the steel plate component 3 by welding.

[0048] Furthermore, the bracket 4 can effectively improve the connection strength between the steel plate and the pipeline, strengthen the entire structure, and by using the bracket 4, the influence of vibration and shock on the pipeline system or structure can be reduced.

[0049] In one embodiment, a positioning portion 9 is provided in the middle of the transverse steel sleeve 1, and the positioning portion 9 is connected to the vertical steel sleeve 7. The positioning portion 9 is made of aluminum alloy material, and a reflective mark is provided on the surface of the positioning portion 9 to facilitate subsequent positioning, deviation correction and drilling.

[0050] Specifically, the reflective mark is used for subsequent laser positioning, which facilitates the subsequent positioning and deviation correction of the jacking construction of the vertical steel sleeve 7.

[0051] Furthermore, the positioning portion 9 is only provided for the pipe segment located at the midpoint of the jacking tunnel. For the pipe segment not located at the midpoint of the jacking tunnel, the steel sleeve is made of steel material as a whole, and no hole needs to be drilled above the middle, and there is no welded aluminum alloy material.

[0052] In one embodiment, the connection between the positioning portion 9 and the steel sleeve is welding, and the diameter of the positioning portion 9 is greater than the sum of the diameters of the two steel strands 2 .

[0053] Specifically, the connection between the positioning portion 9 and the steel sleeve is an embedded connection, and the positioning portion 9 and the nearby steel sleeve are connected by welding.

[0054] Furthermore, to ensure that the two steel strands 2 can pass through the positioning portion 9 of the transverse steel sleeve 1 and enter the interior of the vertical steel sleeve 7 , the inner diameter of the positioning portion 9 must be greater than the sum of the inner diameters of the two steel strands 2 .

[0055] In one embodiment, anchors 5 are provided at both ends of the transverse steel sleeve 1 , and the anchors 5 include an anchor head and an anchor plate, and the diameter of the anchor plate is larger than that of the transverse steel sleeve 1 .

[0056] Specifically, the anchor 5 is a tool for measuring and adjusting direction, which helps to keep the steel casing in the correct position and direction after installation.

[0057] In one embodiment, one end of the single-strand steel strand 2 is fixed to the anchor 5 , and the other end passes through the transverse steel sleeve 1 and the vertical steel sleeve 7 in sequence, and then is fixed to the reaction base 6 .

[0058] Specifically, the steel strand 2 passes through the circular hole reserved in the steel plate member 3 , the linearity of the steel strand 2 is approximately the bending moment envelope of the top pipe, and is bent upward in the middle of the top pipe, and the upwardly bent portion of the steel strand 2 is located in the vertical steel sleeve 7 .

[0059] In one embodiment, the length of a single pipe section of the transverse steel sleeve is no more than 12 m, the inner diameter is 1.8 m, and the wall thickness is 20 mm.

[0060] Specifically, shorter pipe segment lengths mean easier handling and arrangement during transportation, reducing the difficulty and cost of transportation.

[0061] Furthermore, shorter pipe segments are easier to handle and install, which is beneficial to the operability and efficiency of the construction process. Especially in limited working space or complex underground environments, shorter pipe segment lengths help to respond flexibly.

[0062] The specific implementation process is as follows:

[0063] First, one end of the steel strand 2 is fixed to the anchor 5 in advance in the working pit, and the other end passes through the inside of the transverse steel sleeve 1 and the round hole on the steel plate member 3. In order to facilitate the subsequent hooking of the steel strand 2 to the position of the reaction base 6, for a strand of steel strand 2 located in the front half of the jacking pipe, it can be bent and the entire strand of steel strand 2 can be pre-placed in the transverse steel sleeve 1. For a strand of steel strand 2 in the second half of the jacking pipe, the part of the prestressed steel strand 2 that is too long during jacking can be stored in the working pit.

[0064] Furthermore, when the jacking reaches the middle area of ​​the structure, the reinforced area 8 should be grout-reinforced to reduce the disturbance of the soil caused by the subsequent drilling operation. After the jacking step is completed, the vertical steel sleeve 7 is pushed down to a position as close to the jacking pipe as possible by the jacking machine at the ground just above the middle of the jacking pipe structure. During the pushing process, the laser positioning device and the deviation correction device are used to ensure that the target point of the positioning part 9 on the jacking pipe is located at the center of the vertical steel sleeve 7.

[0065] Furthermore, a small diameter drill is placed in the vertical steel sleeve 7, part of the soil between the vertical steel sleeve 7 and the top pipe is drilled, and then the positioning part 9 of the transverse steel sleeve 1 is drilled. The drilling diameter should be larger than the sum of the diameters of the two steel strands 2.

[0066] Furthermore, the small diameter drill is removed from the vertical steel sleeve 7, and a grab hook with an electromagnet at the end is extended downward to the ends of the two prestressed steel strands 2 in the top pipe. The electromagnet at the end of the grab hook is energized, and the ends of the two prestressed steel strands 2 are attracted to the electromagnet and lifted upward to the surface. The prestressed steel strand 2 is tensioned, and its two ends are anchored to the prestressed anchor 5 and the reaction base 6 respectively.

[0067] The present invention has the following beneficial effects:

[0068] 1. Improve the bending resistance: In the present invention, prestressed steel strands are arranged in the jacking pipe, and the bending resistance of the jacking pipe structure is improved by applying prestress to the steel strands.

[0069] 2. Reduce its own weight: The interior of the jacking pipe of the present invention is not filled with concrete, but a steel plate component is used to connect the prestressed steel strand and the steel sleeve into a whole, thereby reducing the dead weight of the structure.

[0070] 3. Not easy to deform: The bending moment characteristic of the steel strand in the jacking pipe in the present invention is approximately a linear bending moment envelope diagram. The bending of the steel strand can reduce the degree of anti-arching produced by the jacking pipe structure, which is beneficial to the long-term deformation control of the structure.

[0071] 4. Improve vertical rigidity: The present invention bends the steel strands in the middle of the jacking tunnel and anchors them on the reaction base on the ground surface, thereby reducing the deflection of the middle of the tunnel under the action of the upper load and improving the vertical rigidity of the jacking tunnel.

[0072] 5. Extending the length of the jacking pipe structure: The present invention improves the bending resistance and vertical rigidity, so that the jacking pipe structure can have a longer length, thereby improving the applicability of the pipe curtain method in long-distance dark excavation projects.

[0073] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0074] It should be noted that, in the present application, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. It should also be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0075] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "connect", "drive" and similar words used in the description of this application should be understood in a broad sense, which can be direct, through an intermediate medium, or the relationship between two elements. Those skilled in the art can understand their specific meanings in this application according to specific circumstances. In this article, "horizontally" and "vertically" are only used to illustrate that one entity is in a vertical relationship with another entity, and do not necessarily require or imply the order between these entities.

[0076] The above embodiments are provided for persons familiar with the art to implement or use the present application. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the application concept of the present application. Therefore, the protection scope of the present application is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A prestressed pipe jacking device, characterized in that: The prestressed pipe jacking device comprises: A steel sleeve, wherein the steel sleeve comprises a plurality of transverse steel sleeves and a plurality of vertical steel sleeves, wherein the transverse steel sleeve comprises a plurality of pipe sections, the plurality of transverse steel sleeves are arranged in parallel, and the vertical steel sleeve is arranged perpendicular to the transverse steel sleeves; A reaction base, the reaction base is fixed on the ground, and the reaction base is connected to the horizontal steel sleeve and the vertical steel sleeve; A connecting mechanism is connected to the plurality of pipe sections and connects the pipe sections to the reaction force base.

2. The prestressed pipe jacking device according to claim 1, characterized in that: The connecting mechanism includes a steel plate member, a bracket and a steel strand; The steel plate member is arranged inside the transverse steel sleeve, and the steel plate member is connected to the pipe section; The bracket is connected to the steel plate component and the pipe joint to fix the steel plate component and the pipe joint; The steel strand is provided with two strands, and the steel strand is connected to the steel plate component, the transverse steel sleeve and the reaction base.

3. The prestressed pipe jacking device according to claim 2, characterized in that: The steel plate component is provided with a plurality of circular holes at equal distances, and the steel strands are placed inside the steel sleeve and pass through the circular holes.

4. The prestressed pipe jacking device according to claim 2, characterized in that: The steel plate component is placed at the midpoint of each pipe section of the transverse steel sleeve, the top of the steel plate component is inscribed in the transverse steel sleeve, and the bottom is placed on the horizontal center line of the transverse steel sleeve.

5. The prestressed pipe jacking device according to claim 2, characterized in that: The steel plate component is configured with a plurality of brackets, and the brackets on one surface of the steel plate component are symmetrically distributed about the vertical center line of the surface, and the brackets are at 45° with the vertical direction.

6. The prestressed pipe jacking device according to claim 2, characterized in that: A positioning part is provided in the middle of the transverse steel sleeve, and the positioning part is connected to the vertical steel sleeve. The positioning part is made of aluminum alloy material, and a reflective mark is provided on the surface of the positioning part to facilitate subsequent positioning, deviation correction and drilling.

7. The prestressed pipe jacking device according to claim 6, characterized in that: The connection between the positioning portion and the transverse steel sleeve is welding, and the diameter of the positioning portion is greater than the sum of the diameters of the two strands of steel wire.

8. The prestressed pipe jacking device according to claim 2, characterized in that: Anchors are arranged at both ends of the transverse steel sleeve, and the anchors include an anchor head and an anchor pad, and the diameter of the anchor pad is larger than that of the transverse steel sleeve.

9. The prestressed pipe jacking device according to claim 8, characterized in that: One end of the single-strand steel strand is fixed on the anchor, and the other end passes through the transverse steel sleeve and the vertical steel sleeve in sequence, and then is fixed on the reaction base.

10. The prestressed pipe jacking device according to claim 1, characterized in that: The length of a single pipe section of the transverse steel sleeve is no more than 12m, the inner diameter is 1.8m, and the wall thickness is 20mm.

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