A vertical jacking riser and main tunnel segment connection structure and method

Abstract

The present application belongs to the technical field of tunnel engineering, and provides a vertical jacking riser and main tunnel segment connection structure and method. The vertical jacking riser and main tunnel segment connection structure comprises a longitudinal bolt connection structure and a ring bolt connection structure; the longitudinal bolt connection structure is used for connecting the riser pipe section and the main tunnel segment in the longitudinal direction of the main tunnel; and the ring bolt connection structure is used for connecting the riser pipe section and the main tunnel segment in the ring direction of the main tunnel. The bolt holes for connecting the main tunnel segment are reserved on the riser pipe section, the bolts are inserted after the riser pipe section is vertically jacked to the designed position, and the riser pipe section is quickly connected, so that the method has the advantages of high connection strength and fast construction progress.

Description

Technical Field

[0001] This invention belongs to the field of tunnel engineering technology, and in particular relates to a structure and method for connecting a vertically jacking riser to the main tunnel segment. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In water conservancy tunnel engineering, the shield tunneling method is commonly used. With the continuous development of intake and drainage outlet construction technology, the vertical jacking method has become increasingly popular compared to traditional construction techniques (such as island cofferdam construction, floating caisson construction, prefabricated sinking, and offshore drilling). It offers advantages such as faster construction progress, avoidance of waterway disruption, and significant cost savings, making it highly favored in large-scale water supply and drainage projects along coastlines and rivers. The vertical jacking method involves installing a movable jacking support inside the existing tunnel. At a predetermined location on the tunnel roof, sections of rectangular or circular pipe sections are jacked upwards, breaking through the soil layer. The top cover of the jacking pipe is then removed underwater to form the intake (drainage) outlet. This construction method avoids the difficulties of extensive above-water operations and allows for "all-weather" construction of the intake (drainage) riser. The jacking process is generally unaffected by surface conditions, wind, waves, and weather, thus reducing project costs and shortening the construction period. The vertical jacking method has been widely used in coastal and riverine areas and has been gradually applied to the construction of large-scale water intake and drainage outlets for thermal power plants, petrochemical plants, urban water intakes, and sewage treatment plants. Water intake and drainage pipelines built using this method are much longer than those constructed using traditional methods, extending into distant sea areas to obtain cleaner water sources or discharge wastewater into the open ocean.

[0004] After the vertical jacking method has lifted all the riser sections into place, to prevent them from falling back under their own weight and the load of water and soil above, a reliable connection must be established between the riser sections and the main tunnel before removing the jacking device. The commonly used connection method is welding. A bracket is installed at the base of the riser section, and the bracket is welded to the main tunnel steel segments. The riser section is then welded to the bracket, or directly welded to the main tunnel segments to form a long-term stable structure. Although this connection method is reliable and effective, the following problems still exist during construction and use:

[0005] (1) The welding quality of the welded connection method is closely related to the skill level of the welder. When the welding conditions are poor, the connection quality cannot be guaranteed and the probability of human error is high. Moreover, the welding positions on site are located at the top of the main tunnel segments and the bracket plates, which are all overhead welding, making the welding operation difficult and increasing the construction difficulty. Generally, welding the riser section directly to the main tunnel segment does not meet the welding strength requirements. It is necessary to set the bracket plates at the riser base and weld them to the main tunnel steel segments. During the welding process, the jacking device supporting the riser section cannot be removed, which makes the installation of the bracket plates difficult. In addition, the welding operation space is narrow, making construction difficult.

[0006] (2) After the riser is lifted, welding is performed between the riser and the main tunnel segment. This process takes a lot of time, involves complex welding techniques, slows down construction, and increases project costs. The residual stress generated by the weld has always been a concern in the project. Excessive welding area can cause warping of the steel plate. The connection between the main tunnel segment and the riser section is subject to complex stresses. The main tunnel segment is an important structural component, and the impact of welding on the main tunnel segment may weaken its load-bearing capacity. Summary of the Invention

[0007] To address at least one of the technical problems mentioned above, this invention provides a structure and method for connecting a vertically jacking riser to the main tunnel segment. This method fully utilizes the speed and convenience of bolt connections in prefabricated assembly. Bolt holes for connection to the main tunnel segment are pre-drilled on the riser section. After the riser section is vertically jacked to the designed position, bolts are inserted for quick connection. This method has the advantages of high connection strength and fast construction progress.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a connection structure between a vertical jacking riser and a main tunnel segment.

[0010] A vertical jacking riser connection structure to the main tunnel segment includes:

[0011] Longitudinal bolted connection structure and circumferential bolted connection structure;

[0012] The longitudinal bolt connection structure is used to connect the riser pipe section and the main tunnel segment in the longitudinal direction of the main tunnel.

[0013] The circumferential bolt connection structure is used to connect the riser pipe section and the main tunnel segment in the circumferential direction of the main tunnel.

[0014] In one embodiment, the longitudinal bolt connection structure includes longitudinal bolt holes and bolts that mate with them, wherein the longitudinal bolt holes are located on the side of the jacking riser section in the longitudinal direction of the main tunnel.

[0015] In one implementation, the longitudinal bolt holes are arranged in an arc shape, with the same curvature as the main tunnel cross section; the position and number of the longitudinal bolt holes are consistent with the position and number of the longitudinal bolts between the segments at the top of the main tunnel.

[0016] In one embodiment, the circumferential bolt connection structure includes circumferential bolt holes and bolts that mate with them. The circumferential bolt holes are located on the side of the jacking riser section in the circumferential direction of the main tunnel.

[0017] In one implementation, the circumferential bolt holes are arranged in a straight line, and the position and number of the circumferential bolt holes are consistent with the position and number of the circumferential bolts between the segments at the top of the main tunnel.

[0018] As one implementation, the connection structure between the vertical jacking riser and the main tunnel segment also includes a water-stopping device, which is disposed between the nut and the bolt hole in the longitudinal bolt connection structure and the circumferential bolt connection structure.

[0019] In one embodiment, the water-stopping device includes a gasket and a waterproof rubber gasket.

[0020] A second aspect of the present invention provides a method for connecting a vertically jacking riser to a main tunnel segment.

[0021] A method for connecting a vertically jacking riser to a main tunnel segment includes:

[0022] In the longitudinal direction of the main tunnel, a longitudinal bolt connection structure is used to connect the riser pipe sections and the main tunnel segments;

[0023] In the main tunnel circumferential direction, a circumferential bolt connection structure is used to connect the riser pipe sections and the main tunnel segments.

[0024] As one implementation method, longitudinal bolt holes are provided on the side of the jacking riser section in the longitudinal direction of the main tunnel, so that the longitudinal bolt holes are arranged in an arc shape, which is the same as the arc of the main tunnel cross section; the position and number of the longitudinal bolt holes are consistent with the position and number of the longitudinal bolts between the segments at the top of the main tunnel.

[0025] As one implementation method, circumferential bolt holes are provided on the side of the jacking riser section in the circumferential direction of the main tunnel, so that the circumferential bolt holes are arranged in a straight line, and the position and number of the circumferential bolt holes are consistent with the position and number of the circumferential bolts between the top segments of the main tunnel.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) This invention makes full use of the quick and convenient bolt connection in prefabricated assembly. Bolt holes for connection with the main tunnel segments are reserved on the riser pipe section. After the riser pipe section is vertically lifted to the design position, bolts are inserted for quick connection. This method has the advantages of high connection strength and fast construction progress.

[0028] (2) This invention optimizes the connection method between the traditional jacking riser and the main tunnel segment by changing the welding to bolt connection, which speeds up the construction efficiency at the structural connection, avoids the problem of insufficient connection strength caused by unstable welding quality, reduces the consumption of auxiliary materials such as welding steel plates, and makes the optimized connection stronger and the connection effect better.

[0029] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0031] Figure 1 This is a schematic cross-sectional view of the present invention used for connecting the vertical lifting riser to the main tunnel segment;

[0032] Figure 2 This is a frontal schematic diagram of the vertically jacking riser section;

[0033] Figure 3 This is a lateral schematic diagram of the vertically jacking riser section;

[0034] Figure 4 Detailed drawing of the bolt holes reserved on the vertical lifting riser section;

[0035] Figure 5 for Figure 4 AA cross-section view.

[0036] Among them: 1: main tunnel segment; 2: riser segment; 3: longitudinal bolt connection structure; 4: circumferential bolt connection structure; 5: waterstop frame; 6: circumferential bolt hole; 7: grouting hole; 8: longitudinal bolt hole; 9: embedded steel pipe; 10: embedded steel bar; 11: embedded annular steel plate; 12: valve head. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Example 1

[0041] according to Figure 1 This embodiment provides a connection structure between a vertical jacking riser and a main tunnel segment, which includes a longitudinal bolt connection structure 3 and a circumferential bolt connection structure 4;

[0042] The longitudinal bolt connection structure 3 is used to connect the riser section 2 and the main tunnel segment 1 in the longitudinal direction of the main tunnel.

[0043] The circumferential bolt connection structure 4 is used to connect the riser section 2 and the main tunnel segment 1 in the circumferential direction of the main tunnel.

[0044] In some specific embodiments, the riser segment cross-section is square or rectangular, the main tunnel segments are assembled with continuous joints, the side length of the riser segment cross-section in the longitudinal direction of the main tunnel is the circumference width of the main tunnel segment or a multiple of the circumference width, and the side length of the riser segment cross-section in the direction perpendicular to the longitudinal direction of the main tunnel is the chord length corresponding to the arc length of the top tunnel segment.

[0045] In this embodiment, the segments connecting the top of the main tunnel to the riser are steel segments, and the riser segment 2 is either a concrete segment or a steel segment. The bolts used to connect the riser segment 2 to the main tunnel segments are the same as the longitudinal bolts and circumferential bolts used for connecting the main tunnel segments.

[0046] Figure 2 This diagram illustrates the circumferential bolt holes pre-drilled on the side of the riser segment for connection to the main tunnel. The longitudinal bolt connection structure includes longitudinal bolt holes and mating bolts. The longitudinal bolt holes are located on the side of the jacking riser segment in the longitudinal direction of the main tunnel. The longitudinal bolt holes are arranged in an arc shape, matching the curvature of the main tunnel cross-section. The position and number of the longitudinal bolt holes correspond to the position and number of the longitudinal bolts between the rings of the top segments of the main tunnel.

[0047] Figure 3This is a schematic diagram showing the longitudinal bolt holes reserved on the side of the riser section for connection with the main tunnel. The riser section 2 also has grouting holes 7 reserved. After the riser section is connected to the main tunnel segment, grout can be injected into the gap between the riser section and the main tunnel segment through the grouting holes 7 to enhance the structural stability of the connection part.

[0048] The circumferential bolt connection structure includes circumferential bolt holes and bolts that mate with them. The circumferential bolt holes are located on the side of the jacking riser section in the circumferential direction of the main tunnel. The circumferential bolt holes are arranged in a straight line, and the position and number of the circumferential bolt holes are consistent with the position and number of circumferential bolts between the segments at the top of the main tunnel.

[0049] The vertical lifting riser and the main tunnel segment connection structure also includes a water-stopping device, which is installed between the nut and the bolt hole in the longitudinal bolt connection structure and the circumferential bolt connection structure.

[0050] It is understood here that in other embodiments, other water-stopping devices may be provided between the nuts and bolt holes in the longitudinal bolt connection structure and the circumferential bolt connection structure, and those skilled in the art can make specific settings according to the actual situation.

[0051] It should be noted that the size, number, and strength grade of the connecting bolts used between the jacking riser sections and the main tunnel segments should be manufactured according to design requirements to meet the bearing capacity requirements of the self-weight of all upper riser sections and the water and soil load on the top cover of the top section.

[0052] In this embodiment, the jacking riser section is a precast concrete section. Figure 4 Detailed drawing of the bolt holes reserved on precast concrete riser section 2, combined with Figure 5 The right side of riser section 2 is the inner wall of the section, and the left side is the outer wall of the section. The bolt holes near the inner wall of riser section 2 are formed by pre-embedded steel pipes 9, which are welded to anchor bars 10. The annular steel plate 11 is welded to the pre-embedded steel pipes 9 and is close to the inner wall of riser section 2. The pre-embedded steel pipes 9, anchor bars 10, and annular steel plate 11 form the rigid structure of the bolt holes of riser section 2. Before the riser section 2 is poured, the rigid structure composed of pre-embedded steel pipes 9, anchor bars 10, and annular steel plate 11 is placed in the steel cage of riser section 2. During the bolt stress process, the rigid structure composed of pre-embedded steel pipes 9, anchor bars 10, and annular steel plate 11 can provide greater resistance and prevent the bolt hole wall from being subjected to large concentrated forces that could damage the riser section 2. Before bolt connection, the bolt holes need to be sealed with rubber sealing plugs 12 to prevent water leakage.

[0053] After the riser segment is connected to the main tunnel segment, a water-stopping device needs to be installed at the connection point. This water-stopping device includes a gasket and a waterproof rubber gasket.

[0054] In this process, after the bolts connecting the riser section to the main tunnel segment are inserted into the bolt holes of the riser section and the main tunnel segment, a gasket and a waterproof rubber washer are placed between the nut and the bolt hole. After tightening the nut, the waterproof rubber washer is squeezed to seal the bolt hole and prevent water leakage from the bolt hole.

[0055] In some embodiments, the bolt fasteners for connecting the riser segment to the main tunnel segment include studs and nuts.

[0056] Specifically, the bolt holes on the riser sections and main tunnel segments are sealed with valve heads during the vertical jacking process of the riser to prevent water from outside the tunnel from entering the tunnel through the bolt holes.

[0057] Example 2

[0058] This embodiment provides a method for connecting a vertically jacking riser to a main tunnel segment, which includes:

[0059] In the longitudinal direction of the main tunnel, a longitudinal bolt connection structure is used to connect the riser pipe sections and the main tunnel segments;

[0060] In the main tunnel circumferential direction, a circumferential bolt connection structure is used to connect the riser pipe sections and the main tunnel segments.

[0061] Specifically, longitudinal bolt holes are set on the side of the jacking riser section in the longitudinal direction of the main tunnel, so that the longitudinal bolt holes are arranged in an arc shape, which is the same as the arc of the main tunnel section; the position and number of the longitudinal bolt holes are consistent with the position and number of the longitudinal bolts between the segments at the top of the main tunnel.

[0062] Specifically, circumferential bolt holes are provided on the side of the jacking riser section in the circumferential direction of the main tunnel, so that the circumferential bolt holes are arranged in a straight line, and the position and number of the circumferential bolt holes are consistent with the position and number of the circumferential bolts between the segments at the top of the main tunnel.

[0063] The specific steps for connecting the vertical jacking riser to the main tunnel segment are given below:

[0064] Step (A): The jacking device is installed in the main tunnel 1. The top pipe section of the riser is connected and fixed to the base of the top pipe segment to be jacked out in the main tunnel. At the same time, a temporary water-stop frame is installed under the opening in the main tunnel. The jacking device is supported on the base of the top pipe section of the riser. The connecting bolts between the pipe segment to be jacked out in the main tunnel and the adjacent pipe segment are removed. The bolt holes are sealed with rubber sealing plugs in a timely manner. Note that the bolt holes on the jacked-out pipe segment and the adjacent connected pipe segment need to be sealed.

[0065] Step (B): The jacking device begins to lift. During the lifting process, the riser pipe section is transported inside the jacking device and connected and fixed to the previous pipe section. The pipe sections are lifted upward one by one.

[0066] Step (C): Transport the riser section into the jacking device, connect and fix the base section to the previous section, and the jacking device starts to lift the base section. After the base section is lifted to the designated position, align the bolt holes on the side wall of the base section with the bolt holes on the main tunnel segment. Pull out the rubber sealing plug valve head that is blocking the bolt holes, insert the double-ended stud, and put the rubber sealing washer and steel washer on the stud exposed on the inner side wall of the base section and the inner side of the end plate of the main tunnel steel pipe segment. Then tighten the nut, and note that the rubber sealing washer is on the side close to the bolt hole.

[0067] Step (D): Remove the jacking device, install the water-stop frame at the joint between the riser section and the main tunnel segment, and complete the connection between the riser and the main tunnel segment.

[0068] It should be noted here that the jacking device is a machine used to lift the pipe section upwards.

[0069] This embodiment utilizes the existing bolt holes on the main tunnel segments. Only the pre-reserved bolt holes need to be added to the riser segments to connect the riser segments to the main tunnel segments with bolts. No other auxiliary connection measures are required. The operation is simple, the construction progress is fast, and it is convenient for tunnel operation, maintenance and replacement.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A connection structure between a vertically jacking riser and a main tunnel segment, characterized in that, include: Longitudinal bolted connection structure and circumferential bolted connection structure; The longitudinal bolt connection structure is used to connect the riser pipe section and the main tunnel segment in the longitudinal direction of the main tunnel. The circumferential bolt connection structure is used to connect the riser pipe section and the main tunnel segment in the circumferential direction of the main tunnel. The longitudinal bolt connection structure includes longitudinal bolt holes and bolts that mate with them. The longitudinal bolt holes are located on the side of the jacking riser section in the longitudinal direction of the main tunnel. The longitudinal bolt holes are arranged in an arc shape, which is the same as the curvature of the main tunnel cross section; the position and number of the longitudinal bolt holes are consistent with the position and number of the longitudinal bolts between the segments at the top of the main tunnel. The circumferential bolt connection structure includes circumferential bolt holes and bolts that mate with them. The circumferential bolt holes are located on the side of the jacking riser section in the circumferential direction of the main tunnel. The circumferential bolt holes are arranged in a straight line, and the position and number of the circumferential bolt holes are consistent with the position and number of the circumferential bolts between the segments at the top of the main tunnel.

2. The vertical lifting riser and main tunnel segment connection structure as described in claim 1, characterized in that, The connection structure between the vertical lifting riser and the main tunnel segment also includes a water-stopping device, which is installed between the nut and the bolt hole in the longitudinal bolt connection structure and the circumferential bolt connection structure.

3. The connection structure between the vertical lifting riser and the main tunnel segment as described in claim 2, characterized in that, The water-stopping device includes a gasket and a waterproof rubber gasket.

4. A method for connecting a vertically jacking riser to a main tunnel segment, characterized in that, include: In the longitudinal direction of the main tunnel, a longitudinal bolt connection structure is used to connect the riser pipe sections and the main tunnel segments; In the circumferential direction of the main tunnel, a circumferential bolt connection structure is used to connect the riser pipe sections and the main tunnel segments; Longitudinal bolt holes are installed on the side of the jacking riser section in the longitudinal direction of the main tunnel, so that the longitudinal bolt holes are arranged in an arc shape, which is the same as the curvature of the main tunnel section; the position and number of longitudinal bolt holes are consistent with the position and number of longitudinal bolts between the segments at the top of the main tunnel. Circumferential bolt holes are installed on the side of the jacking riser pipe section in the circumferential direction of the main tunnel, so that the circumferential bolt holes are arranged in a straight line, and the position and number of circumferential bolt holes are consistent with the position and number of circumferential bolts between the pipe segments at the top of the main tunnel.

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