Improved shield segment mold and prefabricated shield segment with reserved bolt holes

Abstract

The utility model relates to an improved shield segment mold and a prefabricated shield segment with a reserved bolt hole thereof. Electromechanical equipment mounting points are symmetrically arranged on a mold bottom plate by taking a central line of a longitudinal connecting bolt hole of a segment as a reference; the distance between any two adjacent electromechanical equipment mounting points in the circumferential direction is equal and is 1 / 4, 1 / 3 or 1 / 2 of the distance between two adjacent segment longitudinal connecting bolt holes, 1-3 rings of electromechanical equipment mounting points are longitudinally arranged, the distance between the rings is 500-1000 mm, holes are punched at the mounting points to fix auxiliary hole-forming embedded part mounting bases, and after segment structural steel bars are put into a mold, the auxiliary hole-forming embedded part mounting bases are fixed at the mounting points. The distance between a bolt hole reserved through the auxiliary hole forming embedded part and an adjacent structural steel bar is 25 mm-75 mm, and when equipment is installed by reaming the bolt hole reserved in the inner curved surface of the segment in the later period, the structural steel bar in the shield segment is avoided, and an electrical channel between the structural steel bar and trackside electromechanical equipment is cut off.

Description

Technical Field

[0001] The utility model relates to the field of urban rail transit, including shield tunnels of DC traction subway lines and AC traction urban rail lines and high-speed rail lines, and specifically relates to an improved shield segment mold and a prefabricated shield segment with reserved bolt holes. Background Art

[0002] Since the first shield machine was introduced in 1996 and domestically produced in 2008, almost all subway lines in domestic cities and urban rail lines built in recent years have used shield machines for tunnel construction.

[0003] The subway lines are equipped with special subway trains, DC 1500V traction, and a designed speed of 80-100km / h; the urban lines are equipped with EMUs, AC 25000V traction, and a designed speed of 140-200km / h.

[0004] The shield tunnel is made up of several shield segments connected by staggered joints, and the rings are fixed with longitudinal connecting bolts; Figure 5 This is the structural diagram of the lining ring of each ring of the urban area line, attached Figure 6 This is a structural diagram of the subway tunnel lining ring. Each lining ring consists of a capping block, two adjacent blocks, 2 to 5 standard blocks and one arch bottom block shield segment. Each ring of shield segments is connected with circumferential connecting bolts.

[0005] The electromechanical equipment that rail transit usually needs to install in shield tunnels include: temperature-sensing optical fibers, fire manual alarm button boxes, cables, etc. set up by the integrated monitoring system; boxes and boxes of civil 4G / 5G leaky cables, optical cables, power cables and civil 4G / 5G base stations, and optical cable fusion boxes set up by the three major communication operators; railway-specific leaky cables, backbone network optical cables, weak-current cables, boxes and boxes of vehicle-ground wireless communication base stations, and optical cable fusion boxes set up by special communication systems, as well as cameras set up in special locations; leaky cables, optical cables, cables, boxes and boxes of wireless base stations, and optical cable fusion boxes set up by public security / firefighting systems; cables, axle counter electronic boxes, and digital track Circuit boxes, signal machines, no-parking signs, cable junction boxes, etc.; contact network, contact network protection line, contact network access cable, etc. set up by the contact network professional; ring network cable (35kv) set up by the power supply professional; power cables, lighting fixtures, evacuation indicators, distribution boxes, etc. for normal working conditions and emergency conditions set up by the power lighting professional; fire water pipes, fire hydrants, waste water pipes, water pumps, etc. set up by the water supply and drainage professional; evacuation platforms and supporting handrails set up by the tunnel professional; various line signs set up by the track professional. In addition, holes need to be drilled and steel bars implanted on the shield segments under the track to fix the cushion layer under the roadbed to the shield segments.

[0006] In order to reasonably arrange the above-mentioned electromechanical equipment within the limited space of the shield tunnel, the specific installation position of all trackside equipment from the track surface was specified through the tunnel end limit construction drawing during the engineering design.

[0007] The installation of trackside equipment in tunnels involves a total of 12 disciplines. According to calculations, for a single-hole, single-track tunnel, about 30,000 holes need to be drilled and anchor bolts installed on the shield segments per kilometer. The diameter of the anchor bolts ranges from 8mm to 20mm, and the buried depth of the anchor bolts in the shield segments ranges from 50mm to 150mm.

[0008] The conventional installation method is to follow the equipment installation height from the rail surface specified in the limit diagram. Each professional will measure in the tunnel, drill holes with an impact drill, install anchor bolts, and fix their own equipment.

[0009] Due to the large number of construction disciplines and the inability of construction workers to understand the specific locations of the structural steel bars in the shield segments, they often hit the structural steel bars in the shield segments during drilling and have to change the location and drill again. Moreover, the deeper the tunnel is from the ground, the larger the diameter of the tunnel end face, and the higher the train speed, the higher the reinforcement content in the shield segments, and the greater the possibility of drilling into the structural steel bars during drilling. Direct drilling and installation of electromechanical equipment will inevitably lead to cracks, falling pieces, and even water seepage in the shield segments, which not only destroys the structural strength of the shield segments, but also exposes some of the structural steel bars in the shield segments to humid air, reducing the service life of the shield segments. When anchor bolts are implanted in directly drilled holes, there is also the risk of electrical connection due to the close distance between some anchor bolts and the structural steel bars in the shield segments.

[0010] In subway tunnels built in recent years, tunnel professionals have pre-buried chutes on the inner curved surface of shield segments for various system professionals to install trackside electromechanical equipment, avoiding the impact of electromechanical equipment installation on the structural strength and service life of the shield segments. However, since the thickness of the chute is 23mm, and the "Concrete Structure Design Code" requires the concrete cover thickness of the structural steel (structural reinforcement) on the inner curved surface of the shield segment to be 25mm, there is still an allowable error in the thickness of the concrete cover thickness of the structural steel (structural reinforcement) when prefabricating the shield segments. In addition, the chute may deform during transportation and pre-buried, and the pre-buried chute will inevitably be electrically connected to the structural steel in the shield segment (see Figure 4 ).

[0011] Whether drilling holes in the tunnel wall to install electromechanical equipment or installing electromechanical equipment on pre-buried chutes, it is impossible to meet the relevant requirements of the "Technical Specifications for Railway Lightning Protection and Grounding Engineering", "Technical Standards for Metro Stray Current Corrosion Protection", "Technical Specifications for Lightning Protection of Building Electronic Information Systems", "Railway Signal Design Specifications", and "Urban Rail Transit Signal Engineering Construction Quality Acceptance Standards". The hidden dangers brought to the weak current system and related personnel are:

[0012] 1. During thunderstorms, possible induced lightning on the overhead protection lines of the subway and urban rail contact network is introduced into the weak current machine room through the chute / bolts that fix the overhead contact network protection lines, the structural steel bars in the shield segments, the chute / bolts that fix the cable brackets, the integrated sheaths of the trackside optical cables / electric cables, or the weak current integrated through-ground wires, thereby destroying the lightning protection performance of the weak current system.

[0013] 2. During operation, the fluctuating traction return current on the overhead contact network protection line of the urban area line is introduced into the weak current machine room through the contact network protection line fixing bolts, structural steel bars in the shield pipe segment, cable bracket fixing bolts, trackside optical cable / cable integrated sheath, or weak current integrated through-ground wire, thereby destroying the electromagnetic use environment of the weak current machine room.

[0014] 3. On subway lines, overhead contact network protection lines are installed to ensure the safety of contact network power supply. However, when electromechanical equipment is installed on pre-buried chutes, the contact network protection lines will be rendered useless and the following hidden dangers will arise:

[0015] When a flashover accident occurs on the contact network insulator (insulator breakdown), the instantaneous extremely strong fault short-circuit current is introduced into the weak current machine room through the slide groove / bolt of the fixed contact network protection line installation bracket, the structural steel bars in the shield pipe segment, the slide groove / bolt of the fixed cable bracket, and the integrated sheath of the trackside optical cable / cable, causing damage to the weak current cable and even threatening the personal safety of relevant personnel.

[0016] When creepage occurs on the contact network insulator (i.e. leakage caused by degradation of insulator performance), the leakage current flows into the earth through the slide grooves / bolts of the fixed contact network protection line installation bracket, the structural steel bars in the shield segment, the slide grooves / bolts of the fixed cable bracket, the weak current integrated through-ground wire, and the integrated connection network under the underground station, forming stray current, which destroys the performance of the stray current protection system.

[0017] 4. During operation, due to the humidity in the tunnel and occasional water seepage and accumulation in some sections, a large amount of leakage traction return current will inevitably accumulate on the structural steel bars of the shield segments (the highest recorded value is 80A). This current will then flow into the earth through the structural steel bars in the shield segments, the slides / bolts for fixing the cable supports, the weak current integrated through-ground wire, and the integrated connection network under the floor of the underground station, forming stray current, which also damages the performance of the stray current protection system.

[0018] 5. When a line break occurs in the contact network, the instantaneous fault short-circuit current generated will spread to all the electromechanical equipment and pipelines along the track through the structural steel bars in the shield segments and the slides / bolts of the fixed equipment brackets, threatening not only the system equipment (such as the fire accident in the signal building signal room at Xuancheng Railway Station), but also the personal safety of relevant personnel.

[0019] 6. Electromechanical equipment is distributed on the end faces of the entire tunnel. Direct drilling to fix the electromechanical equipment makes it difficult to ensure the installation quality of each electromechanical equipment. During operation, the nuts that fix the electromechanical equipment are prone to loosening and falling off, which not only affects driving efficiency but also endangers driving safety. Moreover, due to the large number of anchor bolts fixing the trackside equipment, it is difficult to maintain during operation. Utility Model Content

[0020] The purpose of the utility model is to overcome the above-mentioned defects and provide a complete set of shield tunnel electromechanical equipment installation solutions, including providing an improved shield segment mold and a shield segment with prefabricated reserved bolt holes, and to solve the problems that the existing electromechanical equipment installation affects the structural strength of the shield segment, reduces the service life of the shield tunnel, damages the performance of the electromechanical system, and even threatens the personal safety of relevant personnel when the contact network fails, and the fasteners of the trackside electromechanical equipment are difficult to maintain by cutting off the electrical channel between the shield segment structure steel bars and the trackside electromechanical equipment inside the shield segment.

[0021] The utility model provides an improved shield segment mold, which improves the existing shield segment mold comprising a mold base, a mold bottom plate, annular side plates, and longitudinal end plates, and is provided with grouting holes, hoisting holes, shield segment connection bolt hand holes, annular side plate reserved shield segment longitudinal connection bolt holes, and longitudinal end plate reserved annular connection bolt holes on the mold bottom plate, and provides other auxiliary hole-forming embedded parts, and is used for prefabricating a shield segment with reserved bolt holes. The utility model is characterized by comprising:

[0022] On the mold bottom plate, several electromechanical equipment installation points are symmetrically arranged with the center line of the shield segment longitudinal connection bolt hole as the reference; the spacing between two adjacent electromechanical equipment installation points in the circumferential direction is equal and is 1 / 4, 1 / 3, or 1 / 2 of the length of the spacing between two adjacent shield segment longitudinal connection bolt holes;

[0023] Arrange 1 to 3 rings of electromechanical equipment installation points longitudinally on the mold base, with an average spacing of 500mm, 600.5mm, 750.5mm, 800.5mm, 900.5mm, or 1000.5mm between the rings;

[0024] Punch holes on the mold base plate at the electromechanical equipment installation point to directly fix other auxiliary hole-forming embedded parts later, or punch holes to fix the tapered hole mold rod, or punch holes to fix the installation base of other auxiliary hole-forming embedded parts;

[0025] After the shield segment structural reinforcement is arranged and the structural reinforcement skeleton is placed in the shield segment mold, the distance between the electromechanical equipment installation point and the adjacent structural reinforcement is 25mm to 75mm.

[0026] The improved shield segment mold provided by the present invention may also have the following feature: other auxiliary hole-forming embedded parts may be stainless steel sleeve embedded parts with internal threads.

[0027] The utility model provides a stainless steel sleeve embedded part with internal thread, which is characterized by comprising a positioning connecting tube, a bolt protection tube, a stainless steel sleeve with internal thread, and a silicone gasket. Among them, the bolt protection tube is an open engineering plastic tube with flanges at both ends; the positioning connecting tube is made of engineering plastic, and is composed of an axially arranged positioning tube and a connecting tube to form a semi-closed integral structure, and the inner cavity is circular or regular polygonal; one end of the positioning tube has two clips protruding radially outward, which are matched with the clip-on mounting base on the improved shield segment mold, or the outer wall of the positioning tube is provided with threads to match the screw-on mounting base on the improved shield segment mold; the other end of the positioning tube is connected to the connecting tube, and the connection part is located on the outside of the flange at one end of the connecting tube; the connection part of the positioning tube and the connecting tube is provided with a self-breaking notch; the outer wall of the other end of the connecting tube is threaded and matched with the stainless steel sleeve with internal thread; the positioning connecting tube is passed through the bolt protection tube and screwed on the stainless steel sleeve with internal thread, and silicone gaskets are arranged between them to form a stainless steel sleeve embedded part; the clip-on mounting base on the improved shield segment mold The features of the seat include: the inner cavity of the clip-on mounting base is matched with the positioning tube clamp, the end face where the clip-on mounting base contacts the positioning tube clamp is divided into two symmetrical parts, and each part is made into an inclined surface in a clockwise direction; the stainless steel sleeve embedded part is inserted into the clip-on mounting base and rotated about 90 degrees, and the sealing and waterproof function is achieved by compressing the silicone gasket with an inclined contact surface; when improving the shield segment mold, the clip-on mounting base is fixed to the electromechanical equipment installation point on the bottom plate of the shield segment mold; before each prefabrication of the shield segment, the stainless steel sleeve embedded part with an internal thread is fixed on the mounting base; when the shield segment is cast and demoulded, the connecting pipe is separated from the positioning pipe along the self-breaking incision, and the connecting pipe, bolt protection pipe and stainless steel sleeve with internal thread are buried in the shield segment, forming a bolt hole with the upper part being the bolt protection pipe and the lower part being the stainless steel sleeve with internal thread.

[0028] The improved shield segment mold provided by the present invention may also have the following features: other auxiliary hole-forming embedded parts bases may also be used as positioning embedded sleeve installation bases; the positioning embedded sleeve installation bases include snap-on positioning embedded sleeve installation bases, screw-on positioning embedded sleeve installation bases, and plug-in positioning embedded sleeve installation bases, and one of them is selected when prefabricating shield segments.

[0029] The improved shield segment mold provided by the present invention may also have the following features: when the improved shield segment mold uses a snap-on mounting base that matches the snap-on positioning embedded sleeve, the matching snap-on positioning embedded sleeve should be used when prefabricating the shield segments. The snap-on positioning embedded sleeve comprises a positioning tube and an embedded tube arranged in the same axial direction, forming a semi-enclosed integral structure; one end of the positioning tube has two radially outwardly protruding clips that match the snap-on mounting base on the bottom plate of the improved shield mold; one end of the embedded tube has a flange that connects to the positioning tube at the flange, the connection portion being located outside the flange at one end of the embedded tube; the other end of the embedded tube is a closed structure, and a self-breaking notch is provided at the interface between the positioning tube and the embedded tube; the outer wall of the embedded tube is provided with a plurality of anti-drop structures, the outer wall of the embedded tube and the anti-drop structures being circular or regular polygonal in shape, and the inner cavities of the positioning tube and the embedded tube being circular or regular polygonal in shape. The snap-on mounting base on the improved shield segment mold features a feature: one end face is divided into two symmetrical sections, each of which is beveled in a clockwise direction. The snap-on positioning embedded sleeve is inserted into the snap-on mounting base and rotated approximately 90 degrees. The contact surface between the clamp on the embedded sleeve and the mounting base is beveled, compressing the silicone gasket to achieve a sealing function. When improving the shield segment mold, the snap-on mounting base is embedded in the electromechanical equipment installation point on the shield segment mold base. When prefabricating the shield segment, the snap-on positioning embedded sleeve is fixed to the snap-on mounting base with a gasket in between. When the shield segment is cast and demolded, the embedded tube is separated from the snap-on positioning tube along the self-breaking cut, and the embedded tube is pre-buried within the shield segment.

[0030] The improved shield segment mold provided by the present invention may also have the following features: when the improved shield segment mold uses a screw-on mounting base, the prefabricated shield segments should use a matching screw-on positioning embedded sleeve. The screw-on positioning embedded sleeve is composed of a positioning tube and an embedded tube arranged in the same axial direction to form a semi-enclosed integral structure; the outer wall of the positioning tube is provided with threads that match the threads of the inner cavity of the screw-on mounting base on the bottom plate of the improved shield segment mold; one end of the embedded tube is provided with a flange connected to the positioning tube at the flange, and the connection portion is located outside the flange at one end of the embedded tube; the connection portion is provided with a self-breaking notch; the outer wall of the embedded tube is provided with a plurality of anti-drop structures; the outer wall shape of the embedded tube and the anti-drop structure is circular or regular polygonal, and the inner cavity of the positioning tube and the embedded tube is circular or regular polygonal. When improving the shield segment mold, the screw-type mounting base is embedded in the electromechanical equipment installation point on the bottom plate of the shield segment mold; when prefabricating the shield segment, the screw-type positioning embedded sleeve is screwed onto the screw-type mounting base, and a gasket is set in between; when the shield segment is cast and demoulded, the embedded pipe is broken along the self-breaking incision and separated from the positioning pipe, and the embedded pipe is embedded in the shield segment.

[0031] The improved shield segment mold provided by the present invention may also have the following features: wherein, when the improved shield segment mold uses a plug-in mounting base, a matching plug-in positioning embedded sleeve should be used when prefabricating the shield segment. The plug-in positioning embedded sleeve is composed of a plurality of positioning claws and embedded pipes arranged in the same axial direction to form a semi-closed integral structure. One end of the positioning claw is a snap buckle that protrudes radially outward and is matched with the inner cavity of the plug-in mounting base on the improved shield segment mold; one end of the embedded pipe is provided with a flange and is connected to the other end of a plurality of positioning claws at the flange, and the connection part is located outside the flange at one end of the embedded pipe, and the other end of the embedded pipe is a closed structure; the outer wall of the embedded pipe is provided with a plurality of anti-falling structures; the outer wall shape of the embedded pipe and the anti-falling structure is circular or regular polygonal; the inner cavity of the embedded pipe is circular or regular polygonal. When improving the shield segment mold, the plug-in mounting base is fixed to the electromechanical equipment installation point on the bottom plate of the shield segment mold; when prefabricating the shield segment, the plug-in positioning embedded sleeve is inserted into the mounting base, and the elasticity of the plastic is used to make the buckle at the end of the positioning claw hook the end face of the plug-in mounting base and fix the plug-in positioning embedded sleeve, with a gasket set in between; when the shield segment is cast and demoulded, the embedded pipe is automatically separated from the positioning claw, and the embedded pipe is buried in the shield segment.

[0032] The improved shield segment mold provided by the present invention may also have the following features: when the selected threaded positioning embedded sleeve or plug-in positioning embedded sleeve is not equipped with an installation base, holes can be directly drilled and internal threads can be tapped at the installation point of the electromechanical equipment on the bottom plate of the shield segment mold to thread the embedded positioning sleeve, or holes can be directly drilled to install the plug-in positioning embedded sleeve.

[0033] The improved shield segment mold provided by the present invention may also have the following features: one end of the tapered hole mold rod is a cone, and the other end of the tapered hole mold rod is installed at the electromechanical equipment installation point on the bottom plate of the shield segment mold, and a tapered boss with a height of about 8-12mm extends upward from the surface of the bottom plate of the shield segment mold. When the prefabricated shield segment is cast and demolded, the boss forms a tapered hole of 8-12mm on the inner curved surface of the shield segment.

[0034] The improved shield segment mold provided by the present invention may also have the following features: the structural steel bars in the shield segment should be reinforced according to the electromechanical equipment installation points determined in the shield segment mold with reserved bolt holes provided by the present invention, and the distance between the installation point and the adjacent structural steel bars is 25mm to 75mm.

[0035] The improved shield segment mold provided by the present invention may also have the following features: after the structural steel bar skeleton is placed in the shield segment mold, the distance between the installation base of the tapered hole mold rod or other auxiliary hole embedded parts and the structural steel bar is 25mm to 75mm.

[0036] The shield segment with reserved bolt holes prefabricated by the improved shield segment mold provided by the utility model has the following characteristics:

[0037] On the inner curved surface of the shield segment, bolt holes are reserved symmetrically with the center line of the shield segment longitudinal connection bolt holes. The spacing between any two adjacent bolt holes in the circumferential direction is equal, and the spacing between two adjacent bolt holes in the circumferential direction is 1 / 4, 1 / 3, or 1 / 2 of the spacing between the longitudinal connection bolt holes of two adjacent shield segments; 1 to 3 rings of bolt holes are reserved longitudinally, and the average spacing between rings is 500mm, 600.5mm, 750.5mm, 800.5mm, 900.5mm, or 1000.5mm;

[0038] Reserve bolt holes by pre-embedding auxiliary hole-forming embedded parts;

[0039] The distance between the bolt hole and the adjacent structural steel bars in the shield segment is 25mm to 75mm.

[0040] The utility model provides a shield segment with reserved bolt holes, which also has the following characteristics: wherein, a tapered hole with a depth of about 8-12 mm is reserved on the inner curved surface of the shield segment through a tapered mold rod, and when installing electromechanical equipment, an impact drill is used to expand the tapered hole, implant anchor bolts, and fix the equipment;

[0041] The utility model provides a shield segment with reserved bolt holes, which also has the following features: wherein, auxiliary formed pre-buried pipes are embedded in the curved surface of the shield segment to reserve bolt holes, and when installing electromechanical equipment, an impact drill is used to expand the holes in the pre-buried pipes, implant anchor bolts, and fix the equipment;

[0042] The shield segment with pre-reserved bolt holes provided by the present invention also has the following characteristics: bolt holes with a depth of 30mm to 49mm, or 51mm to 59mm, or 61mm to 100mm are reserved on the inner curved surface of the shield segment by pre-embedded auxiliary hole-forming embedded parts. When installing electromechanical equipment, an impact drill is used to expand the holes in the pre-embedded pipes, insert anchor bolts, and fix the equipment, thereby reducing disturbance to the shield segment structure.

[0043] The utility model provides a shield segment with reserved bolt holes, which also has the following characteristics: a pre-embedded stainless steel sleeve with an internal thread is buried in the inner curved surface of the shield segment to form a bolt hole with a bolt protection tube at the upper part and a stainless steel sleeve with an internal thread at the lower part. When installing electromechanical equipment, the connecting pipe is removed and the equipment is fixed on the stainless steel sleeve with an internal thread using the bolts of the fixing equipment.

[0044] The utility model provides a shield segment with reserved bolt holes, which also has the following characteristics: wherein, bolt holes are reserved by auxiliary hole-forming embedded parts buried in the shield segment, and the bolt holes formed by the embedded pipes of the embedded auxiliary hole-forming embedded parts should be a semi-closed structure, which can prevent sewage from entering the inner cavity of the embedded pipe into the segment and corroding the structural steel bars; the material of the auxiliary hole-forming embedded parts selected for the reserved bolt holes should be halogen-free, flame-retardant PC, or ABS, or PC / ABS, or other modified engineering plastics, and the embedded auxiliary hole-forming embedded parts should be semi-closed. The outer diameter of the pipe is not more than 10mm, and by expanding the hole, it can meet the installation requirements of the reserved holes for all anchor bolts for fixing trackside equipment; the reserved bolt holes are perpendicular to the tangent of the inner curved surface installation point of the shield segment, and the inner diameter of the auxiliary hole-forming embedded pipe is 3mm~6mm. It guides the drill bit when expanding the reserved holes for electromechanical equipment installation, ensuring that each implanted anchor bolt is perpendicular to the curved surface, so as to improve the installation quality of trackside equipment. During the later installation of electromechanical equipment, each anchor bolt is equipped with an anti-loosening nut to achieve lifelong maintenance-free fasteners for all trackside equipment.

[0045] Functions and effects of utility models

[0046] By using the improved shield segment mold and the shield segment with prefabricated bolt holes provided by the utility model, the conventional method of installing the trackside electromechanical equipment based on the track surface is optimized to installing the electromechanical equipment directly at the bolt holes reserved in the shield segment, thus eliminating the need for the process of measuring all trackside equipment before installation, which not only saves a lot of manpower and material resources but also speeds up the progress of engineering construction; the bolt holes for installing the electromechanical equipment are formed at the shield segment prefabrication stage, avoiding the structural steel bars in the shield segment, and in the later stage, only the holes need to be enlarged at the installation bolt holes and the electromechanical equipment needs to be installed. On the one hand, this method addresses the passive drilling method's issues with shield segment fragmentation, cracking, water seepage, and exposure of structural reinforcement to humid air, which can reduce the shield segment's structural strength and shorten its service life due to the installation of electromechanical equipment. Furthermore, the reserved bolt holes are prefabricated away from the structural reinforcement, and the anchor bolts for the fixing equipment are positioned 25 to 75 mm from the structural reinforcement. This effectively isolates the electrical path from the structural reinforcement within the shield segment to the electromechanical equipment, preventing induced lightning on the catenary protection line from being introduced into the weak current equipment room and improving the lightning protection performance of the weak current system equipment. It also prevents fluctuating traction return current on the catenary protection line in the AC traction section from being introduced into the weak current equipment room, improving the electromagnetic environment for weak current equipment. In the event of a catenary disconnection in the shield segment, the 25 to 75 mm gap between the structural reinforcement within the shield segment and the trackside electromechanical equipment ensures the safety of the trackside electromechanical equipment and maintenance personnel. In the event of a flashover on the catenary insulators in the DC traction section, the insulation resistance created by the 25mm to 75mm gap between the catenary protection wire and the shield segment structural reinforcement, and between the shield segment structural reinforcement and the trackside electromechanical equipment, ensures the safety of the electromechanical equipment and maintenance personnel. In the DC traction section, due to humidity and water accumulation in the tunnel, significant stray currents inevitably accumulate on the shield segment structural reinforcement. The insulation resistance created by the 25mm to 75mm gap between the shield segment structural reinforcement and the trackside electromechanical equipment effectively blocks the electrical path for stray currents accumulated on the structural reinforcement to flow directly to the earth through the trackside weak-current equipment and the weak-current integrated through-ground wire, thereby improving the performance of the stray current protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of an improved shield segment mold in an embodiment of the utility model;

[0048] Figure 2 This is a planar expansion diagram of the positional relationship between the improved shield segment mold and the structural steel reinforcement skeleton in the embodiment of the utility model;

[0049] Figure 3 This is a product diagram of a shield segment with reserved bolt holes prefabricated by using the improved shield segment mold provided by the utility model;

[0050] Figure 4 It is a fault current flow analysis diagram in the prior art;

[0051] Figure 5 It is a diagram of the ring structure of the urban line lining in the prior art;

[0052] Figure 6 It is a diagram of the ring structure of subway line lining in the prior art;

[0053] Figure 7 This is a schematic diagram of a template for arranging reserved bolt holes in shield segments for urban railroads provided by the utility model;

[0054] Figure 8 This is another schematic diagram of a template for arranging reserved bolt holes in shield segments for urban railroads provided by the present invention;

[0055] Figure 9 This is a schematic diagram of a template for arranging reserved bolt holes in shield segments for subway lines provided by the present invention;

[0056] Figure 10 This is a structural diagram of the clip-on positioning embedded sleeve used in the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model in the first embodiment;

[0057] Figure 11 This is a structural diagram of the screw-type positioning embedded sleeve used in the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model in the second embodiment;

[0058] Figure 12 This is a structural diagram of the plug-in type positioning embedded sleeve used in the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model in the third embodiment;

[0059] Figure 13 This is a structural diagram of the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model, which is a stainless steel sleeve embedded part with internal threads used in the fourth embodiment;

[0060] Figure 14 This is a schematic diagram of the structure of the tapered hole-forming die rod of the auxiliary hole-forming component used in the fifth embodiment of the improved shield segment die provided by the present invention. DETAILED DESCRIPTION

[0061] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments, in combination with the accompanying drawings, specifically illustrate the shield segment mold with reserved bolt holes and the prefabricated shield segment with reserved bolt holes of the present invention.

[0062] <Example 1>

[0063] Figure 1 This is a structural diagram of an improved shield segment mold in an embodiment of the utility model. Figure 2 This is a planar expansion diagram of the positional relationship between the improved shield segment mold and the structural steel reinforcement skeleton in the embodiment of the utility model. Two layers are arranged in the shield segment, each layer has several main bars and several hoop bars. The intersections of the main bars and hoop bars are welded together to form the shield segment structural steel reinforcement skeleton. Figure 3 This is a product diagram of a shield segment with reserved bolt holes prefabricated by using the improved shield segment mold provided by the utility model.

[0064] like Figure 1 、 Figure 2 as well as Figure 3 As shown, the utility model provides an improved shield segment mold, which improves the existing shield segment mold 10 including a mold base plate 11, annular side plates 12, and longitudinal end plates 13, as well as grouting holes and shield segment connection bolt hand holes set on the mold base plate 11, and shield segment longitudinal connection bolt holes 15 and annular connection bolt holes reserved in the annular side plates and longitudinal end plates. It also provides a positioning pre-embedded pipe auxiliary hole-forming embedded part 20 for prefabricating a shield segment 200 with reserved bolt holes 100, including:

[0065] The electromechanical equipment installation points are symmetrically arranged with the center line of the shield segment longitudinal connection bolt hole 15 as the reference. The spacing d2 between two adjacent installation points in the circumferential direction should be equal and be 1 / 4, 1 / 3, or 1 / 2 of the spacing d3 between the two adjacent shield segment longitudinal connection bolt holes; 1 to 3 rings of electromechanical equipment installation points are arranged longitudinally, with the average spacing between the rings being 500mm, 600mm, 750mm, 800mm, 900mm, or 1000mm, and holes are drilled at the electromechanical equipment installation points, and several holes are embedded as shown in the following example: Figure 14 The reserved holes for mounting bolts of electromechanical equipment shown in the figure are formed into taper holes, or are inlaid for fixing such as Figure 10 、 11 The mounting bases of the other auxiliary hole-forming members 20 shown in 12 and 13 can fine-tune the lengths d1, d2, and d3 in order to balance the positional relationship between the steel bars and the reserved holes.

[0066] Among them, the mold base plate 11, the annular side plate 12, and the longitudinal end plate 13 enclose a casting trough 14 for forming the outline of the prefabricated shield segment. The casting trough 14 is used to place the structural steel skeleton as the prefabricated shield segment. After the structural steel skeleton is placed in the shield segment mold with reserved bolt holes, the distance between the tapered hole mold rod or the auxiliary hole embedded part and the adjacent structural steel bar 301 is 25mm to 75mm.

[0067] Combine Figure 1 and Figure 2The spacing between two adjacent circumferential electromechanical equipment installation points is 1 / 4, 1 / 3, or 1 / 2 of the spacing between two adjacent shield segments' longitudinal connection bolt holes. Correspondingly, the spacing d2 between two adjacent tapered hole-forming die rods or other auxiliary hole-forming members 20 is 1 / 4, 1 / 2, or 1 / 2 of the spacing d3 between two adjacent shield segments' longitudinal connection bolt holes 15. The spacing d1 between two adjacent rows of tapered hole-forming die rods or other auxiliary hole-forming members 20 is 500mm, 600mm, 750mm, 800mm, 900mm, or 1000mm. A structural steel bar skeleton is placed in the casting trough 14 as a prefabricated shield segment. In order to balance the positional relationship between the steel bars and the reserved holes, the lengths of d1, d2, and d3 can be fine-tuned.

[0068] Combine Figure 1 and Figure 3 After the structural steel skeleton is put into the mold, the shield segment 200 is formed. The inner curved surface of the shield segment 200 forms a plurality of electromechanical equipment installation bolt holes 100. When the electromechanical equipment is installed, the electromechanical equipment installation bolt holes 100 are expanded. The distance between the implanted fixed electromechanical equipment anchor bolts and the adjacent structural steel bars 301 in the shield segment is 25mm to 75mm.

[0069] Combine Figure 10 Other auxiliary hole-forming components 20 use pre-embedded positioning sleeves, which include snap-on positioning sleeves, snap-on mounting bases fixed to the bottom plate of the improved shield segment mold, and gaskets. The snap-on positioning sleeves are composed of snap-on positioning tubes and embedded tubes to form a semi-enclosed integral structure. The snap-on positioning tubes have snap joints, and the inner cavity of the snap-on mounting bases has snap-on grooves that match the snap joints. A self-breaking notch is provided at the interface between the snap-on positioning tubes and the embedded tubes. The snap-on mounting bases are embedded in the bottom plate of the shield segment mold, and the snap-on positioning tubes are snap-on to the snap-on mounting bases with a gasket provided therebetween. When the precast shield segment is cast and demoulded, the embedded tubes of the snap-on positioning sleeves are broken off along the self-breaking notch and embedded in the shield segment to form mounting bolt holes.

[0070] Figure 10 It is a structural schematic diagram of the clip-on positioning embedded sleeve used in the first embodiment of the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model.

[0071] Combine Figure 10Specifically, the positioning embedded sleeve consists of a snap-on positioning embedded sleeve 11a, a mounting base 11b, and a rubber gasket 11c. The snap-on positioning tube 1101 and the embedded tube 1102 are an integral structure, and the interface is located outside the flange 1103 at the end of the embedded tube 1102. A cutout 1104 is provided at the interface. When the shield segment is demoulded, the positioning tube 1101 and the embedded tube 1102 are automatically separated at the cutout 1104, and the cutout surface is smooth and beautiful. An anti-falling device of a regular hexagonal boss 1107 is provided on the outside of the embedded tube 1102. The boss 1107 is matched with an 11mm inner hexagon socket. The embedded tube 11 02 has moderate tightness when inserted into the hexagonal socket, and will not fall under the action of gravity, which facilitates the adjustment of local processes in the shield segment production process from the original "installing the positioning embedded sleeve on the bottom plate of the shield segment mold, and then putting the structural steel skeleton into the mold" to "installing the positioning embedded sleeve after the structural steel skeleton is put into the mold", thereby improving the embedding success rate of the positioning embedded sleeve; the left view of the snap-on positioning tube 1101 is 1105, and the right view of the embedded tube 1102 is 1106. The right view of the mounting base 11b is 1109, the end face is flat, and it is tightly attached to the flange 1103 of the embedded pipe 1102; the left view of 11b is 1110, and the end face is optimized into two inclined surfaces from small to large in a clockwise direction, which are connected to the buckle at the end of the positioning tube; the inner cavity of the mounting base 11b is matched with the buckle of the positioning tube 1101. During installation, the embedded positioning sleeve is inserted into the mounting base, rotated 90 degrees, and the rubber gasket 11c is compressed to achieve the sealing function.

[0072] <Example 2>

[0073] The difference from Example 1 is that the positioning embedded sleeve includes a threaded positioning embedded sleeve, a threaded mounting base and a gasket; the threaded positioning embedded sleeve is a semi-closed integral structure composed of a threaded positioning tube and an embedded tube, the end of the threaded positioning tube has an external thread, the inner cavity of the threaded mounting base has an internal thread matching the external thread, a self-breaking notch is provided at the interface between the threaded positioning tube and the embedded tube, the threaded mounting base is embedded in the bottom plate of the shield segment mold, the threaded positioning tube is threaded on the threaded mounting base, and a gasket is provided between them, and when the prefabricated shield segment is cast and demoulded, the embedded tube of the threaded positioning embedded sleeve is broken along the self-breaking notch and embedded in the bolt hole for installing the forming equipment in the shield segment.

[0074] Figure 11 It is a structural schematic diagram of the screw-type positioning embedded sleeve used in the second embodiment of the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model.

[0075] Combine Figure 11Specifically, the embedded positioning sleeve consists of a threaded embedded positioning sleeve 12a, a mounting base 12b, and a rubber gasket 12c. The threaded positioning tube 1201 and the embedded tube 1102 form an integral structure. The interface is located outside the flange 1103 at the end of the embedded tube 1102. The interface is provided with a notch 1104 to automatically separate the positioning tube from the embedded tube when the shield segment is demolded, and the notch surface is smooth and beautiful. A regular hexagonal boss 1107 is provided on the outside of the embedded tube 1102 to prevent it from falling off. The boss 1107 is compatible with a standard hexagonal socket, allowing installation with a lithium-ion drill to improve installation efficiency. The inner cavity of the positioning tube 1201 is square 1205, which facilitates the removal of the remaining positioning tube from the mounting base with a lithium-ion drill equipped with a square bit after the shield segment is demolded. The left side view of the threaded positioning tube 1201 is 1205, and the right side view of the embedded tube 1102 is 1106. The right side view of the mounting base 12b is 1208, and the inner cavity thread 1209 of the mounting base 12b matches the outer thread of the positioning tube 1201 and is loosely matched.

[0076] <Example 3>

[0077] The difference from Example 1 is that the embedded part of the positioning embedded sleeve includes a plug-in positioning embedded sleeve, a plug-in mounting base and a gasket fixed on the improved shield segment mold; the plug-in positioning embedded sleeve is a semi-closed integral structure composed of a plug-in positioning part and an embedded pipe, the plug-in positioning part is composed of a plurality of positioning claws, the end of the positioning claw is a clip extending radially outward, the inner cavity of the plug-in mounting base matches the outer diameter of the plurality of positioning claws, the plug-in mounting base is embedded in the bottom plate of the shield segment mold, and the elastic contraction of the engineering plastic is used to insert the positioning claw into the mounting base. After being inserted into place, the elasticity of the plastic is used to make the clip at the end of the positioning claw hook the end face of the mounting base for fixation, and a gasket is arranged in between. When the prefabricated shield segment is cast and demoulded, the embedded pipe of the plug-in positioning embedded sleeve is separated from the positioning claw and the embedded pipe is embedded in the bolt hole for installing the forming equipment in the shield segment.

[0078] Figure 12 It is a structural schematic diagram of the plug-in positioning embedded sleeve used in the third embodiment of the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model.

[0079] Combine Figure 12The difference from the first embodiment is that the embedded positioning sleeve consists of a plug-in embedded positioning sleeve 13a, a mounting base 13b, and a rubber gasket 13c. Several plug-in positioning claws 1301 are integrally formed with the embedded pipe 1102. The interface is located outside the flange 1103 at the end of the embedded pipe 1102. An anti-drop device, a regular hexagonal boss 1104, is provided on the outside of the embedded pipe 1102. The left side view of the plug-in positioning claw 1301 is 1305, and the right side view of the embedded pipe 1102 is 1106. The right side view of the mounting base 13b is 1307. The inner cavity of the mounting base 13b is a circular through hole 1308. The diameter of the through hole 1308 is designed to facilitate the insertion of the plug-in positioning claw 1301. After insertion, the elasticity of the engineering plastic is used to allow the buckle on the positioning claw 1301 to hook onto the bottom plane of the mounting base 13b.

[0080] <Example 4>

[0081] The difference from Example 1 is that the other auxiliary hole-forming parts 20 use stainless steel sleeve embedded parts with internal threads, and the stainless steel sleeve embedded parts with internal threads include a positioning connecting pipe, a bolt protection pipe, a stainless steel sleeve with internal threads, a gasket, and a mounting base fixed on the improved shield pipe segment; the positioning connecting pipe is composed of a snap-on positioning pipe and a connecting pipe arranged in the same axial direction to form an integral structure, and a self-breaking notch is provided at the connection; the positioning connecting pipe passes through the bolt protection pipe and is screwed on the stainless steel sleeve with internal threads to form a positioning embedded component. When the prefabricated shield pipe segment is cast and demoulded, the positioning pipe of the positioning connecting pipe is separated from the embedded pipe at the self-breaking notch, and the connecting pipe of the outer bolt protection pipe and the stainless steel sleeve with internal threads screwed at the end of the connecting pipe are embedded in the shield pipe segment together; sealing gaskets are arranged between the stainless steel sleeve with internal threads and the bolt protection pipe, between the bolt protection pipe and the positioning connecting pipe, and between the positioning connecting pipe and the mounting base.

[0082] Figure 13 This is a structural schematic diagram of the auxiliary hole-forming embedded part included in the improved shield segment mold provided by the utility model, which is a stainless steel sleeve embedded part with internal threads used in the fourth embodiment.

[0083] Combine Figure 13The stainless steel sleeve embedded part with internal thread consists of a stainless steel sleeve 14a with internal thread, a bolt protection tube 14c, a positioning connecting tube 14e, a mounting base 14g, and a sealing gasket 14b between the stainless steel sleeve 14a with internal thread and the bolt protection tube 14c, a sealing gasket 14d between the bolt protection tube 14c and the positioning connecting tube 14e, and a sealing gasket 14f between the positioning connecting tube 14e and the mounting base 14g. The right side view of the stainless steel sleeve 14a with internal threads is 1401; the bolt protection tube 14c is used to adjust the burial depth of the stainless steel sleeve 14a with internal threads in the shield segment. The bolt protection tube is made of engineering plastic and has flanges at both ends. The inner cavity diameter matches the outer diameter of the stainless steel bolts that match the stainless steel sleeve 14a with internal threads. The right side view is 1402; the positioning connecting tube 14e is a transitional product. When the electromechanical equipment is installed, the positioning connecting tube 14e is taken out, and the trackside equipment to be installed is fixed to the stainless steel sleeve with internal threads embedded in the shield segment through stainless steel bolts. The positioning connecting tube 14e is made of engineering plastic. The positioning tube 1404 and the semi-enclosed connecting tube 1405 form an integral structure. The interface part is located on the outside of the flange 1406 at the end of the connecting tube 1405, and a cutout 1407 is provided on the interface part. The left side view of the snap-on positioning tube 1404 is 1409, and the right side view of the connecting tube 1405 is 1410. The right side view of mounting base 14g is shown as 1411, with a flat end surface connected to the positioning connecting pipe. The left side view of mounting base 14g is shown as 1412, with two clockwise inclined surfaces. The inner cavity of mounting base 14g is compatible with the positioning pipe 1404. The pitch and length of the threads 1408 on the outer wall of the connecting pipe match the threads of the inner cavity of the internally threaded stainless steel sleeve. Alternatively, positioning connecting pipe 14h can be used in place of positioning connecting pipe 14e, and mounting base 14i can be used in place of mounting base 14g to complete the pre-embedding of the internally threaded stainless steel component in the shield segment.

[0084] <Example 5>

[0085] The difference from Example 1 is that a conical hole mold rod is embedded in the installation point of the electromechanical equipment, one end of the conical hole mold rod is a cone, and the other end of the conical hole mold rod is embedded in the bottom plate of the shield segment mold. A conical boss with a height of about 10 mm is made on the surface of the bottom plate of the shield segment mold. When the prefabricated shield segment is cast and demoulded, a concave hole is formed on the inner curved surface of the shield segment as a bolt hole for equipment installation.

[0086] Figure 14 It is a structural schematic diagram of the fixed cone hole-forming die rod used in the fifth embodiment of the auxiliary hole-forming component included in the improved shield segment die provided by the utility model.

[0087] Combine Figure 14Specifically, a hexagonal screw with a diameter of 10 mm is used to process the tapered hole mold rod 15a. 1502 is the right view. The total length of the screw is the thickness of the shield segment mold base plate + the 8-12 mm long cone 1504 at the head; according to the design drawing, holes are drilled and internal threads are tapped on the shield segment mold base plate, and the tapered hole mold rod 15a is screwed from bottom to top on the shield segment mold base plate, so that conical bosses 8 mm to 12 mm higher than the base plate are formed on the shield segment mold base plate. Alternatively, a tapered punching die rod 15b can be machined from 10mm diameter round steel. 1503 is the right side view. One end of the round steel is machined into a cone 1504 with a length of 8mm-12mm. According to the design, holes are drilled in the shield segment mold baseplate. The tapered punching die rod 15b is inserted into the holes in the shield segment mold baseplate and welded together, forming conical bosses that rise 8mm-12mm above the baseplate. After the shield segment is cast, conical holes with a depth of 8mm-12mm are formed at the electromechanical equipment mounting points on the shield segment's curved surface.

[0088] <Example 6>

[0089] See Figure 1 、 Figure 2 For the 1.2m wide shield segments of the subway, shield segments with the same type of reserved bolt holes are usually used for splicing in the shield tunnel. The spacing d1 between the reserved bolt hole rings is 600mm, and the average spacing between the rings is 600.5mm (including the allowable gap between the shield segments).

[0090] Preferably, two types of shield segments with reserved bolt holes are used in the shield tunnel. The two types of shield segments are used alternately when splicing the tunnel. Two rings of bolt holes are reserved in one type of shield segment, and the spacing d1 between the rings is 800mm. A ring of bolt holes is reserved in the center of the other type of shield segment, and the average spacing of the three rings of bolt holes on the two rings of segments is 800.5mm.

[0091] <Example 7>

[0092] See Figure 1 、 Figure 2 For the 1.5m wide shield segments of the subway, shield segments with the same type of reserved bolt holes are usually used for splicing in the shield tunnel. The spacing d1 between the reserved bolt hole rings is 750mm, and the average spacing between the rings is 750.5mm.

[0093] Preferably, two types of shield segments with reserved bolt holes are used in the shield tunnel. When splicing the tunnel, the two types of shield segments are used alternately. Two rings of bolt holes are reserved on one type of shield segment, and the spacing d1 between the rings is 1000mm. A ring of bolt holes is reserved in the center of the other type of shield segment, and the average spacing between the rings is 1000.5mm.

[0094] <Embodiment 8>

[0095] See Figure 1 、 Figure 2 For the 1.8m wide shield segments of the urban area line, shield segments with the same type of reserved bolt holes are usually spliced ​​in the shield tunnel. The spacing d1 between the reserved bolt hole rings is 900mm, and the average spacing between the rings is 900.5mm.

[0096] Preferably, two types of shield segments with reserved bolt holes are used in the shield tunnel. Two rings of bolt holes are reserved on the Type I shield segment, and the spacing d1 between the rings is 900mm. An additional ring of reserved bolt holes is added within the spacing d3 between the two rings of reserved holes on the Type II shield segment. The spacing between the added ring of bolt holes and the original two rings of bolt holes is 400mm and 500mm respectively. When splicing shield tunnels, Type I shield segments with reserved bolt holes are used when there is no need for contact network installation, and two rings of Type II segments are used at the coordinates where contact network supports need to be installed.

[0097] <Example 9>

[0098] See Figure 1 、 Figure 2 For the 2m wide shield segments of the urban area line, shield segments with the same type of reserved bolt holes are usually spliced ​​in the shield tunnel. The spacing d1 between the reserved bolt hole rings is 1000mm, and the average spacing between the rings is 1000.5mm.

[0099] Preferably, two types of shield segments with reserved bolt holes are used in the shield tunnel. Two rings of bolt holes are reserved on the Type I shield segment, and the spacing d1 between the rings is 1000mm. An additional ring of reserved bolt holes is added within the spacing d3 between the two rings of reserved holes on the Type II shield segment. The spacing between the additional ring of bolt holes and the original two rings of bolt holes is 400mm and 600mm respectively. When splicing shield tunnels, Type I shield segments with reserved bolt holes are used when there is no need for contact network installation, and two rings of Type II segments are used at the coordinates where contact network supports need to be installed.

[0100] The following is a detailed description of the shield segments prefabricated with reserved bolt holes using the improved shield segment mold provided by the present invention in conjunction with the prior art in a metropolitan line or subway line:

[0101] Combine Figure 1 When casting shield segments, after cleaning and applying mold release agent to the improved shield mold, install the tapered hole mold rod 15a or other auxiliary hole embedded parts 20 on the base of the auxiliary hole embedded parts of the mold bottom plate. Then, with someone helping, place the structural steel bar skeleton steadily into the casting trough 14 surrounded by the bottom plate 11, side plate 12, and end plate 15, and control the distance between the auxiliary hole embedded parts and the adjacent structural steel bars 301 to be 25mm to 75mm.

[0102] See Figure 4 ,Should Figure 4 This is a fault current flow analysis diagram in the prior art, where two rails 501 are return rails for train traction. For DC traction subway lines, a stray current collection network 502 is set up in the roadbed below the rails. The overhead contact network 503, contact network protection line 504, and insulators 505 between the contact networks are fixed to the shield pipe segment through the contact network mounting bracket of the DC traction section or the contact network suspender 506 of the AC traction section. The optical cable and power cable 508 laid on the weak current cable bracket 507 are introduced into the tunnel at both ends. In the weak current machine room at the end station, the weak current integrated through-ground wire 509 installed under the weak current bracket 507 is connected to the integrated grounding network 510 set under the station floor through the weak current machine rooms at both ends of the tunnel. The outer shells 511 of all cabinets in the weak current machine room are connected to the weak current integrated through-ground wire 509. The trackside weak current box 512 and the weak current cable bracket 507 are all connected to the weak current integrated through-ground wire 509 through the equipotential connecting line 513. All trackside equipment is fixed to the shield segment 514 by bolts or pre-buried slide grooves 517. The "Technical Specifications for Railway Lightning Protection and Grounding Engineering" requires the use of the inner longitudinal and circumferential structural steel bars 515 of the secondary lining shield segment 514 and the longitudinal and circumferential shield segment connecting bolts 516 as the contact network line break protection grounding body. When bolts or slides 517 are used to install trackside equipment, and some bolts or slides 517 are in contact with or too close to the structural steel bars in the shield segment, the fault current channels formed between the contact network protection line 504 and the weak-current optical cable 508, the contact network protection line 504 and the trackside equipment 512, the contact network protection line 504 and the weak-current integrated through-ground wire 509, and the stray current accumulated on the structural steel bars 515 in the shield segment and the weak-current integrated through-ground wire 509 are 518, 519, and 520, respectively. 521 is the channel where the DC current leaking from the rails in the DC traction section is accumulated on the structural steel bars in the shield segment.

[0103] See Figure 5 、 Figure 6The single-hole single-line lining ring of the urban line is composed of eight shield segments 101, namely a capping block (F), two adjacent blocks (L1 and L2) connected to the capping block, four standard blocks (B1 to B4), and an arch bottom block (ZD); the single-hole single-line lining ring of the subway line is composed of six shield segments 201, namely a capping block (F), two adjacent blocks (L1 and L2) connected to the capping block, two standard blocks (B1 and B2), and an arch bottom block (ZD); the circumferential shield segments are fastened with connecting bolts 102 or 202, and a lifting and grouting hole 103 or 203 is set at the center of each shield segment, and two grouting holes 104 are added on each urban line shield segment.

[0104] Figure 7 This is a schematic diagram of a template for arranging reserved bolt holes in shield segments for urban rail transit provided by the present invention. Figure 8 This is another schematic diagram of a template for arranging reserved bolt holes in shield segments for urban rail transit provided by the present invention. Figure 9 It is a schematic diagram of a template for arranging reserved bolt holes in shield segments for subway lines provided by the present invention.

[0105] See Figure 7 、 Figure 8 、 Figure 9 Each shield segment is provided with a lifting and grouting hole 801, two grouting holes 802, three longitudinal connecting bolts 804, two circumferential connecting bolts 805, and a connecting bolt hand hole 803 is provided for each shield segment connecting bolt; two layers are arranged in the shield segment, each layer has several main bars 806 and several hoop bars 807, and each intersection of the main bars and hoop bars is welded together to form a shield segment structural steel skeleton.

[0106] See Figure 7 Preferably, when the contact network hanger is installed in an external hanging manner, the distance between two adjacent installation points 808 in the ring is equal and is 1 / 3 or 1 / 2 of the distance between two adjacent longitudinal connecting bolts of the shield segment.

[0107] See Figure 8 , preferably, when the reserved bolt holes are needed to install the contact network sling, two rings need to be assembled at the coordinates of the contact network sling. Figure 8The shield segment shown in the figure is provided with three rings of mounting points 808 in the shield segment, wherein a second ring of mounting points 808 is added between the first ring of mounting points 808 and the third ring of mounting points 808; the first ring and the second ring of mounting points 808 are used to fix the contact wire hanger, and the distance between the rings is adapted to the distance between the two longitudinal bolt holes on the contact wire hanger mounting base; the first ring and the third ring of mounting points 808 are used to install other trackside electromechanical equipment, and the average spacing between the rings is 667 mm; the mounting points 808 in the rings are symmetrically arranged with the longitudinal connecting bolts of the shield segment as the base point, and the distance between two adjacent mounting points 808 in the first ring and the second ring is 1 / 4 of the distance between two adjacent connecting bolts 804 in the longitudinal direction of the shield segment, and the distance between two adjacent mounting points 808 in the third ring is 1 / 2 of the distance between two adjacent connecting bolts 804 in the longitudinal direction of the shield segment.

[0108] See Figure 9 Preferably, it is suitable for 1.5-meter-wide shield segments in single-hole, single-track subway tunnels. Three rings of mounting points 808 are set in the shield segment. The average spacing between the first and second ring mounting points 808 and the second and third ring mounting points 808 is 500 mm. The mounting points in the ring are symmetrically arranged with the longitudinal connecting bolts of the shield segment. The spacing between two adjacent mounting points 808 in the ring should be the same or similar, and be 1 / 4 and 1 / 3 of the distance between two adjacent longitudinal connecting bolts 804 of the shield segment.

[0109] In this embodiment, parts not described in detail are well-known technologies in the art.

[0110] Functions and Effects of the Embodiments

[0111] The improved shield segment mold and the shield segment with prefabricated reserved bolt holes provided by the utility model optimize the method of installing the trackside electromechanical equipment based on the track surface as the reference to directly installing the electromechanical equipment at the reserved bolt holes of the shield segment, eliminating the need for the process of measuring all trackside equipment before installation, which not only saves a lot of manpower and material resources but also speeds up the progress of engineering construction; the bolt holes for installing the electromechanical equipment are formed at the prefabrication stage of the shield segment, avoiding the structural steel bars in the shield segment, and later on, it is only necessary to expand the holes at the bolt holes for installing the equipment and install the electromechanical equipment, which solves the problem of the usual problem of drilling holes on the shield segment for installing the electromechanical equipment. Problems such as falling segments, cracks, water seepage, and exposure of structural reinforcement to humid air in some shield segments have reduced the structural strength and shortened the service life of the shield segments. Furthermore, the bolt holes for equipment installation are prefabricated away from the structural reinforcement, and the anchor bolts are kept 25mm to 75mm away from the structural reinforcement in the shield segments. This effectively cuts off the electrical path between the structural reinforcement in the shield segments and the electromechanical equipment, preventing induced lightning on the catenary protection line from being introduced into the weak current room, thus improving the lightning protection performance of the weak current system equipment. Furthermore, it prevents the fluctuating traction return current on the catenary protection line in the AC traction section from being introduced into the weak current room, thus improving the electromagnetic environment for the weak current equipment. In the event of a catenary break in the shield segment, the insulation resistance created by the 25mm to 75mm gap between the structural reinforcement in the shield segments and the trackside electromechanical equipment protects the trackside electromechanical equipment and maintenance personnel. When a flashover occurs on the catenary insulators in the DC traction section, the insulation resistance created by the 25mm to 75mm gap between the catenary protection wire and the shield segment structural reinforcement, and between the shield segment structural reinforcement and the trackside electromechanical equipment, reduces the safety risks faced by electromechanical equipment and maintenance personnel. In the DC traction section, due to humidity and water accumulation in the tunnel, a large amount of stray current inevitably accumulates on the shield segment structural reinforcement. The insulation resistance created by the 25mm to 75mm gap between the shield segment structural reinforcement and the trackside electromechanical equipment blocks the electrical path for stray current accumulated on the structural reinforcement to flow directly to the earth through the trackside weak current equipment and the weak current integrated through-ground wire, thereby improving the performance of the stray current protection system.

[0112] Furthermore, a mounting base of a tapered hole-forming die rod or other auxiliary hole-forming embedded parts is embedded at the electromechanical installation point. Other auxiliary hole-forming parts include positioning embedded sleeves and stainless steel sleeve embedded parts with internal threads, which can meet various needs in the prefabrication stage of the shield segment. The process is simple. The bolt holes reserved by the tapered hole-forming die rod or other auxiliary embedded parts are vertically formed on the inner curved surface of the prefabricated shield segment. The electromechanical equipment is not easy to loosen or fall off after installation, which can improve the installation quality of the electromechanical equipment. In addition, the use of stainless steel sleeve embedded parts with internal threads can reserve stainless steel sleeves after the installation bolt holes are formed, which is convenient for installation.

[0113] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. An improved shield segment mold, comprising a shield segment mold base plate, annular side plates, longitudinal end plates, grouting holes, hoisting holes, segment connection bolt hand holes, annular side plate reserved segment longitudinal connection bolt holes, and longitudinal end plate reserved annular connection bolt holes, and positioning pre-embedded casing auxiliary hole-forming embedded parts, for prefabricating shield segments with reserved bolt holes, characterized in that: include: A number of electromechanical equipment installation points are symmetrically arranged based on the longitudinal connection bolt holes of the segments. The spacing between any two adjacent installation points in the circumferential direction should be equal and be 1 / 4, 1 / 3, or 1 / 2 of the spacing between the two adjacent longitudinal connection bolt holes of the segments. One to three rings of electromechanical equipment installation points are arranged longitudinally, with an average spacing between rings of 500 mm, 600.5 mm, 750.5 mm, 800.5 mm, 900.5 mm, or 1000.5 mm. Punch holes to fix the auxiliary hole-forming embedded parts at the electromechanical equipment installation point, or punch holes to fix the tapered hole mold rod, or punch holes to fix the auxiliary hole-forming embedded parts installation base; after the pipe segment structure steel bars are arranged and the pipe segment structure steel bar skeleton is placed in the shield pipe segment mold with reserved bolt holes, the distance between the electromechanical equipment installation point and the adjacent pipe segment structure steel bars is 25mm to 75mm.

2. The improved shield segment mold according to claim 1 is characterized in that: The fixed tapered hole die rod comprises: installing the tapered hole die rod at the electromechanical equipment installation point, and making a tapered boss with a height of 8-12 mm on the surface of the mold bottom plate.

3. The improved shield segment mold according to claim 1, characterized in that: The auxiliary hole-forming embedded part installation base includes: a stainless steel sleeve installation base with an internal thread, or a positioning embedded sleeve installation base; the positioning embedded sleeve installation base includes: a snap-on positioning embedded sleeve installation base, a screw-type positioning embedded sleeve installation base, and a plug-in positioning embedded sleeve installation base; one of them is selected when prefabricating shield segments.

4. The shield segment with reserved bolt holes prefabricated by the improved shield segment mold is characterized by: include: On the inner curved surface of the shield segment, the reserved bolt holes are symmetrically reserved with the center line of the shield segment longitudinal connection bolt hole as the reference, the spacing between any two adjacent bolt holes in the circumferential direction is equal, and the spacing between two adjacent bolt holes in the circumferential direction is 1 / 4, 1 / 3, or 1 / 2 of the spacing between the two adjacent longitudinal connection bolt holes of the segment; 1 to 3 rings of bolt holes are reserved longitudinally, and the average spacing between the rings is 500mm, 600.5mm, 750.5mm, 800.5mm, 900.5mm, or 1000.5mm; Bolt holes are reserved by pre-embedded auxiliary hole-forming embedded parts; the distance between the bolt holes and the adjacent segment structural steel bars in the shield segment is 25mm to 75mm.

5. The shield segment according to claim 4, characterized in that: Bolt holes are reserved by pre-embedded auxiliary hole-forming embedded parts. The material of the selected auxiliary hole-forming embedded parts should be halogen-free, flame-retardant PC, or ABS, or PC / ABS, or modified engineering plastics, and the outer diameter of the embedded pipe of the auxiliary hole-forming embedded parts shall not exceed 10mm; the reserved bolt holes are perpendicular to the tangent at the installation point of the inner curved surface of the shield segment, and the inner diameter of the selected auxiliary hole-forming embedded parts is 3mm~6mm; the reserved bolt holes should use semi-enclosed structure auxiliary hole-forming embedded parts, and the surface of the embedded pipe should have an anti-falling device.

6. The shield segment according to claim 4, characterized in that: The reserved bolt holes include: Conical bolt holes with a depth of 8-12 mm are reserved on the inner curved surface of the shield segment through a conical mold rod; Alternatively, pre-buried pipes may be buried to assist in forming bolt holes with a depth of 30 mm to 49 mm, or 51 mm to 59 mm, or 61 mm to 100 mm; Alternatively, a stainless steel sleeve embedded part may be buried to reserve a bolt hole with a bolt protection tube at the top and a stainless steel sleeve with an internal thread at the bottom.

7. The shield segment according to claim 6, characterized in that: The stainless steel sleeve embedded part includes a positioning connecting pipe, a bolt protection pipe, a stainless steel sleeve with an internal thread, and a silicone gasket; the positioning connecting pipe passes through the bolt protection pipe and is screwed onto the stainless steel sleeve with an internal thread, with a silicone gasket disposed between them; wherein: The bolt protection tube is an open engineering plastic tube with flanges at both ends; The positioning connecting pipe is a semi-enclosed integral structure composed of a positioning pipe and a connecting pipe, and the inner cavity is a circle or a regular polygon; One end of the positioning tube is provided with two clips protruding radially outward; the other end of the positioning tube is connected to the connecting tube, and the connecting part is located outside the flange at one end of the connecting tube; the connecting part between the positioning tube and the connecting tube is provided with a self-breaking notch; the outer wall of the other end of the connecting tube is threaded and matched with the internal thread of the stainless steel sleeve.

Images