Construction method for empty-pushing station-crossing of shield tunneling machine in cramp field

Abstract

The invention belongs to the field of tunnel construction, and particularly relates to a shield tunneling machine empty-pushing station-crossing construction method for cramping sites, which is characterized in that a shield tunneling machine starting base is used as a foundation, and a trolley steel plate is welded at the bottom and used as a station-crossing trolley; after the shield main body is received by a station-passing trolley at the receiving end of the shield main body, the station-passing trolley and the shield main body are welded into a whole, and bracket supporting seats are welded to the two sides of the shield main body; jacking the shield main body by using a jack to jack the station-crossing trolley together with the shield machine to the inverted arch filling layer, and putting I-shaped steel and a site steel plate below the station-crossing trolley, so that the steel plate laying plane is consistent with the elevation of the station inverted arch layer; then the jack is supported between the propelling plate and the propelling counter-force seat, and the shield main body is propelled to advance on the rolling shaft on the site steel plate; the station-crossing trolley is jacked every time the station-crossing trolley is pushed forwards by a certain distance, the site steel plate is moved forwards to a next excavation interval, and the steps are repeated to complete station crossing; the construction method is suitable for empty pushing station crossing of the cramped site, the construction efficiency is high, and the economic benefit is good.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and particularly relates to a construction method for pushing a shield machine through a station in a narrow site by empty pushing. Background Technique

[0002] The statements in this part only provide background technical information related to the present disclosure, and do not necessarily constitute prior art.

[0003] In the early stage of subway construction, there are generally two methods for the shield machine to pass through the station. The first is the more traditional method of building a launching shaft and a receiving shaft in each excavation section. Each time the next section is excavated, the shield main body needs to be separated and hoisted, and then hoisted again for the next excavation cycle for secondary launching. The second is to first excavate the shield tunnel in one go, and then excavate the station part. Some of the shield segments at the station location need to be demolished. The first construction method requires more large-scale hoisting equipment and labor, which affects the construction cost. The second construction method requires secondary demolition of the segments, and during the shield construction process, the station part cannot be constructed synchronously, increasing the time cost. The traditional station construction and shield excavation section construction not only increase the construction cost but also increase the construction period.

[0004] Pushing the shield machine through the station by empty pushing means that when the construction site is narrow, the shield hoisting condition is not available, or the station is closed and the shield machine cannot be hoisted in, the whole shield machine (or split body) is pushed to the launching position at the other end of the station by means of jacking and sliding. Taking the example of passing through the station by being pulled by a winch, the process is to place the shield machine on the passing platform trolley, and the trolley is directly placed on the steel plate, and the steel plate is paved from the hoisting wellhead to the launching wellhead; the winch pulls the shield main body, and the shield machine passes through the station by relying on the mutual sliding between the passing platform trolley and the site steel plate. However, this method of pulling the shield main body through the station by a winch has low efficiency and long construction time.

[0005] Therefore, there is an urgent need for a construction method that combines shield construction and station construction, which can reduce the construction period, save construction costs, and is a safe and economical construction method for pushing a shield machine through a narrow site. Summary of the Invention

[0006] The purpose of the invention is to overcome the deficiencies of the prior art and provide a construction method for pushing a shield machine through a station in a narrow site by empty pushing.

[0007] In order to achieve the above purpose, the invention provides the following technical solutions:

[0008] A construction method for pushing a shield machine through a station in a narrow site by empty pushing includes the following steps:

[0009] S1. Fix a trolley steel plate at the bottom of the launching pedestal as a passing trolley; level the site in the shield passing area of the station invert.

[0010] After the passing trolley receives the shield main body, it fixes the shield main body on the passing trolley to form a shield trolley combination; bracket support seats are welded on both sides of the shield main body respectively.

[0011] S3. Use a jack to lift the bracket support seat upwards to raise the shield trolley combination, place site steel plates under the shield trolley combination and make the site steel plates at the same elevation as the invert through heightening measures.

[0012] S4. A propulsion plate is welded at the tail of the passing trolley, and several propulsion reaction seats are installed on the site steel plates.

[0013] S5. Place a roller every 0.5 - 1.0 m on the site steel plates, retract the jacks, and place the passing trolley and the shield main body on the rollers.

[0014] S6. Place the two retracted jacks between the propulsion plate and the propulsion reaction seats; start the hydraulic devices on both sides simultaneously to push the passing trolley and the shield main body forward.

[0015] S7. After the passing trolley moves forward by at least the length of one shield main body, reinstall the jacks vertically, lift the bracket support seats through the jacks to make the shield trolley combination separate from the site steel plates; use the on - site winch or electric hoist to pull the site steel plates forward for a certain distance, and then retract the jacks to lower the shield trolley combination so that the shield trolley combination lands on the rear part of the site steel plates.

[0016] Repeat step S6 and step S7 to push the shield main body forward until the next shield excavation section.

[0017] Further, the construction method for the shield machine to be pushed through the station in a cramped site further includes step S8: Use a battery locomotive to tow the trailing equipment to pass through the station along the rail line laid on the invert; connect the trailing equipment and the shield main body to complete the passing of the shield machine through the station.

[0018] Further, in step S1, the passing trolley is welded and fixed all around with stoppers and steel supports.

[0019] Further, in step S2, the length of the site steel plates is 2.5 - 4 times the length of the shield main body; a propulsion reaction seat is welded every 1.5 - 2.5 m on the site steel plates.

[0020] Further, in step S2; after the passing trolley receives the shield main body, disconnect the connection between the shield main body and the trailing equipment and the connection bridge; the connection bridge is supported and fixed on the segment trolley with a support frame.

[0021] Further, in step S2, when the tail shield is connected to the middle body, the tail shield and the middle body are welded into one body through steel plates; both sides of the bracket support seat are strengthened and welded through thick steel plates.

[0022] Furthermore, the roller is made of round steel with a diameter of 80 mm and a length of 500 mm; the placement interval of the rollers is 0.5 m.

[0023] Furthermore, in step S6, when the shield main body is advanced, the track laying of the trailing equipment is carried out, and 4 tracks are arranged at each support section.

[0024] Furthermore, in step S7, the total length L1 of the forward propulsion distance of the shield car assembly is the same as the pulling length L2 of the site steel plate; the maximum values of L1 and L2 are the difference between the length of the site steel plate and the shield machine.

[0025] The present invention provides a construction method for pushing a shield machine through a station in a narrow site. Briefly speaking, based on the starting base of the shield machine, a small car steel plate with a certain thickness is welded at the bottom to receive the main part of the shield body and used as a passing station car; after the main part of the shield is received by the passing station car at the receiving end of the shield main body, the connection between the shield main body and the trailing equipment and the connecting bridge (during the passing process, the connecting bridge is mainly used to place shield pipelines and connect and tow battery locomotives for passing the station) is disconnected, the passing station car is welded to the shield main body as a whole, and two bracket supports are welded on each side of the shield main body; the bracket supports on both sides of the shield main body are jacked up by jacks to lift the passing station car together with the shield machine above the inverted arch filling layer, and I-beams and site steel plates are laid under the passing station car to make the plane of the laid site steel plate consistent with the elevation of the station inverted arch layer; two propulsion plates are welded at the tail end of the passing station car, and several propulsion reaction seats are installed on the laid site steel plate; a roller is placed every half meter between the passing steel plate and the site steel plate, the jacks are retracted, and the passing station car and the shield main body are placed on the laid site steel plate and rollers; jacks are placed between the propulsion reaction seats of the site steel plate and the thrust plates of the passing station car, and the jacks on both sides are started at the same time to push the passing station car forward; every time it is advanced a certain distance, the shield main body together with the passing station car is jacked up once, and the site steel plate is pulled forward to the next excavation section by a winch or an electric hoist; the trailing equipment passes through the rails laid on the inverted arch, and the whole trailing equipment is towed through the station by a battery locomotive and connected to the shield main body to complete the passing of the station.

[0026] The beneficial effects of the present invention are as follows:

[0027] The construction method of the present invention is applicable to pushing through a station in a narrow site. Compared with the traditional method of laying rails to move the shield main body, this method uses a specially made site steel plate to pad on the inverted arch, making the inverted arch stress more uniform and causing less damage to the inverted arch; during the construction process, the site steel plate is displaced by pulling forward with a winch or an electric hoist, and there is no need to transfer it from the side of the shield machine, which is applicable to the construction of pushing a shield machine through a station in a narrow site; the construction method of the present invention is based on the starting base of the shield machine, and the main materials of the method are only small car steel plates, site steel plates, rollers and four jacks, and the material cost is low.

[0028] The construction method of the present invention has high construction efficiency and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The attached drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0030] Figure 1 It is a top view structural schematic diagram of the passing trolley in the embodiment of the present invention.

[0031] Figure 2 is Figure 1 The sectional view structural schematic diagram along the A-A direction in.

[0032] Figure 3 is Figure 1 The sectional view structural schematic diagram along the B-B direction in.

[0033] In the figure: 1 - shield cutter head; 2 - front shield; 3 - middle shield; 4 - tail shield; 5 - weld seam; 6 - steel support; 7 - trolley steel plate; 8 - roller; 9 - site steel plate; 10 - bracket support seat; 11 - jack; 12 - starting base; 13 - propulsion plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0035] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0036] A construction method for a shield machine to be pushed through a station in a narrow site includes the following steps:

[0037] S1. Construction preparation: Weld the trolley steel plate 7 under the starting base 12, transform the starting base 12 of the shield machine into a passing trolley for the shield main body to pass through the station, and fix stoppers or steel supports 6 around the trolley steel plate 7. Weld and fix the stoppers and steel supports 6 to the shield main body respectively to prevent the passing trolley from moving after receiving the shield main body; Level the site in the shield passing area of the station invert. Figures 1 - 3 The shield main body, the stopper or steel support 6, the trolley steel plate 7 and the passing trolley are schematically drawn in, and the shield main body includes a shield cutter head 1, a front shield 2, a middle shield 3 and a tail shield 4;

[0038] S2. Shield on the gantry: After the passing trolley receives the shield main body, disconnect the shield main body from the trailing equipment and the connecting bridge, then weld the shield main body to the passing trolley as a whole. At the same time, weld the tail shield 4 to the middle body (also known as the support ring). After that, weld two front and two rear bracket supports 10 on both sides of the entire shield body;

[0039] S3. Preparation for shield propulsion: The welded shield main body and the passing trolley are lifted upwards as a whole by the jacks 11, so that the trolley steel plate 7 welded under the passing trolley is in a suspended state. First, lay several I-beams on the basis of the starting pedestal 12 of the passing trolley to fill the suspended part under the trolley steel plate 7. Then, lay the site steel plate 9 on the I-beams so that the bottom surface of the site steel plate 9 is at the same elevation as the invert elevation, which is convenient for pulling the site steel plate 9 onto the invert later; The basis of the starting pedestal 12 is the basis at the shield machine receiving place. Since the horizontal plane at the shield receiving place is lower than the horizontal plane of the passing site, after the shield machine is received by the passing trolley at the receiving place after tunneling out of the hole, it is necessary to lift the shield machine and the passing trolley and pad them up with I-beams to the same horizontal height as the passing site, so that the passing trolley and the passing site are at the same horizontal plane, which is convenient for propulsion through the station;

[0040] S4. Weld the propulsion plate 13 at the tail of the passing trolley and install the propulsion reaction seat on the site steel plate 9; As Figure 1 、 Figure 3 schematically shows the position of the propulsion plate 13;

[0041] S5. Place a roller 8 every 0.5 - 1.0 m on the site steel plate 9, retract the jacks 11 and slowly place the passing trolley and the shield main body on the rollers 8 of the laid site steel plate 9;

[0042] S6. Place the two retracted jacks 11 between the propulsion plate 13 and the propulsion reaction seat; At the same time, start the hydraulic devices on both sides to push the passing trolley and the shield main body forward;

[0043] S7. After the passing trolley moves forward at least the length of one shield main body, reinstall the jacks 11 vertically, and lift the shield main body and the passing trolley by jacking the bracket supports 10 so that they are separated from the site steel plate 9; Use the winch or electric hoist in the site to pull the site steel plate 9 forward to the next passing path, and lower the passing trolley and the shield main body so that the passing trolley lands on the rear part of the site steel plate 9; In the present invention, the entire site steel plate 9 is laid on the designed route of the shield main body on the station invert, replacing the conventional method of laying temporary tracks, which can disperse the stress on the invert and prevent the shield machine from damaging the invert surface;

[0044] Repeat step S6 and step S7 to push the shield main body forward until the next shield excavation section;

[0045] S8. Use a battery locomotive to pull the supporting equipment through the station via the steel rail line laid on the invert; after connecting with the shield main body, the shield machine completes the station passing.

[0046] Furthermore, in step S1, the size of the trolley steel plate 7 is similar to that of the starting base 12, and can be slightly larger to facilitate the welding of the propulsion plate 13. The trolley steel plate 7 is welded from multiple steel plates with a thickness of 20 mm and a width of 500 mm, and the weld 5 is spaced 150 mm apart; the transit trolley is welded and fixed with blocks and steel supports 6 on all sides to ensure that each side of the blocks and steel supports 6 is double-sidedly welded; the height of the blocks and steel supports 6 is greater than the starting base 12, and the height of the blocks and steel supports 6 can be different; the blocks and steel supports 6 are arranged on both sides of the starting base 12, so that the bottom of the shield body can be supported on the steel supports 6 or the blocks, with the purpose of providing auxiliary support to the bottom of the shield body and sharing the force of the starting base 12.

[0047] Furthermore, in step S1, the length of the site steel plate 9 is 2.5 to 4 times the length of the shield body; in this embodiment, the length of the shield body is 8m, and the size of the site steel plate 9 laid on the site after the site of the transit trolley route is leveled can be 30000mm×1000mm×20mm, and a propulsion reaction seat is welded on the site steel plate 9 every 2m; the propulsion reaction seat serves as the base of the jack 11 when propulsing the shield body.

[0048] Further, in step S2, before the shield body arrives at the receiving position, the oil pipe and cable line are marked, and after the shield body is on the station trolley, the pipeline is disassembled and the oil pipe is placed on the connecting bridge, the cable is placed on trailer No. 1, and the segment transport trolley is driven out; one end of the connecting bridge is supported by a support frame of 175H steel support 6, the support frame is a portal type, and the support frame is welded to the segment trolley;

[0049] After the shield body is completely pushed onto the receiving bracket, the shield body is disconnected from the connecting bridge, and the disconnection position is selected at the connection between the front and rear ends of the connecting bridge; various pipelines on the connecting bridge that are firmly supported on the support frame are disassembled and separated from the main machine at the same time.

[0050] Furthermore, in step S2, when the tail shield 4 is connected to the middle body, the tail shield 4 and the middle body are welded together with 200×200×20mm steel plates; when the corbel support seat 10 is installed, two parallel jacking corbel support seats 10 are welded on the left and right sides of the shield body with 30mm thick steel plates.

[0051] Furthermore, in step S3, during jacking, four 100T hydraulic jacks 11 are placed under the bracket support seats 10 on the left and right sides of the shield main body, and then the jacks 11 are started to lift the station-passing trolley together with the shield main body.

[0052] Further, in step S5, the roller 8 is made of round steel with a diameter of 80 mm and a length of 500 mm; the placement interval of the rollers 8 is 0.5 m; compared with directly pushing the shield main body on the site steel plate 9, the roller 8 increases the passing efficiency of the shield main body.

[0053] Further, in step S6, the other two jacks 11 after being retracted are placed between the pushing plate 13 and another pushing reaction seat, and the hydraulic devices on both sides are started to push the passing trolley forward; that is, in step S6, the 4 jacks 11 originally used to lift the bracket support 10 are alternately placed in two groups between the pushing plate 13 and the pushing reaction seat, and alternately push the passing trolley and the shield main body forward;

[0054] If the number of rollers 8 is limited, during the forward movement of the passing trolley, the used rollers 8 at the back should be promptly taken to the front of the shield body and placed on the site steel plate 9.

[0055] Further, in step S7, after using the jack 11 to push the passing trolley and the shield main body forward by A meters, the jacks 11 around the shield main body are reinstalled, and the shield main body is lifted to separate the passing trolley from the site steel plate 9; then, use the winch or electric hoist at the station site to pull the underlying site steel plate 9 forward by A meters, and then place the shield main body and the passing trolley on the rollers 8 of the site steel plate 9 again; in this embodiment, since the length of the shield machine is 8 m and the length of the site steel plate 9 is 30 m, assuming that the front edge of the shield main body advances to the front end of the site steel plate 9, the maximum advancing distance of the shield main body and the forward pulling distance of the site steel plate 9 can be 22 m.

[0056] Further, in step S8, the front connecting bridge of the rear support equipment is placed on the segment transport vehicle, and a cross beam is welded on the No. 2 trailer of the rear support. Use a 70T battery locomotive to tow the rear support equipment to pass through the station on the laid rail line, and connect the rear support and the shield main body to complete the passing through the station; compared with towing the rear support through the station by a winch, towing the rear support through the station by a battery locomotive has higher efficiency.

[0057] Specifically, in step S6, when the shield main body is pushed forward, the track of the rear support equipment is laid. The laid track uses 43 kg / m rails, the length of each rail is 6.25 m, the track form is four tracks and two lines, the center distance between the two outer tracks is 2100 mm, the net distance between the inner tracks is 900 mm, and the distance between the tracks is fixed by channel steel in the middle; the inner track is the track for the battery locomotive, and the outer track is the track for the rear support trolley, and the rear support trolley is towed through the station by the battery locomotive.

[0058] The operation key points that need attention in this construction method are as follows: (1) Before the shield machine passes through the station, the structural dimension boundary conditions of the shield passing area of the under-construction station are measured actually to ensure the passing space of the shield machine in the station. The platform of the station and the track roof air duct shall not be constructed to avoid affecting the smooth passage of the shield machine and the trailing gantry. (2) During the main propulsion process of the shield machine, the preset route may deviate. During the propulsion process, the hydraulic jack 11 or the roller 8 shall be used in time according to the actual situation to correct the deviation by adjusting the placement orientation.

[0059] Next, the construction period will be described by taking the passing section of a certain station as an example. The total length of the passing section of a certain station is 223 meters, and the length of the main body of the shield machine is 10 meters.

[0060] The 30-meter site steel plates are adopted, the stroke of the propulsion cylinder is 2m, and the propulsion speed of the cylinder changes according to the actual situation on site. Generally, it is one cylinder stroke in 1.5 hours, that is, the main body of the shield machine moves forward 2m in 1.5h. Then the total length of this passing section is 223m, and the total working hours are 8 days. Compared with the passing of the shield machine by winch traction, it can save 12 days of preliminary preparation working hours. The passing speed is fast. Compared with the passing of the trailing equipment by winch traction, it can save 10 days of construction period. In total, 22 days of construction period can be saved. This construction method can greatly shorten the construction period.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are within the scope of the claims of the present invention awaiting approval.

Claims

1. A construction method for shield machine empty push through station in a narrow site, characterized in that: The following steps are involved: S1, a trolley steel plate (7) is fixed at the bottom of the starting base (12) as a transit trolley; Level the site of the station's invert shield tunnel passing area; S2, after the station-passing trolley receives the shield body, the shield body is fixed on the station-passing trolley to form a shield trolley assembly; and bracket support seats (10) are respectively welded on both sides of the shield body; S3, using a jack (11) to lift the bracket support seat (10) upwards to raise the shield trolley assembly, and padding the site steel plate (9) under the shield trolley assembly and taking padding measures to make the site steel plate (9) and the invert arch elevation at the same position; S4, a propulsion plate (13) is welded to the rear of the transit trolley, and a plurality of propulsion reaction seats are installed on the site steel plate (9); S5. Place a roller (8) every 0.5 to 1.0 m on the site steel plate (9), retract the jack (11), and place the station-passing trolley and the shield body on the roller (8); S6, placing the two folded jacks (11) between the propulsion plate (13) and the propulsion reaction seat; and simultaneously starting the hydraulic devices on both sides to propel the station-passing trolley and the shield body forward; S7, after the station-passing trolley moves forward by at least the length of the shield main body, the jack (11) is reinstalled vertically, and the bracket support seat (10) is lifted by the jack (11) so that the shield trolley assembly is separated from the site steel plate (9); the site steel plate (9) is pulled forward by the on-site winch or electric hoist for a certain distance, and then the jack (11) is retracted to lower the shield trolley assembly so that the shield trolley assembly falls on the rear of the site steel plate (9); Repeat steps S6 and S7 to push the shield machine body forward until the next shield excavation section.

2. The method of construction of shield machine empty push through station in narrow site according to claim 1 is characterized by: The step S8 is also included, wherein the rear supporting equipment is towed by a battery locomotive through the rail line laid on the invert to pass through the station; and the rear supporting equipment is connected with the shield main body to complete the shield machine passing through the station.

3. The method of construction of shield machine empty push through station in narrow site according to claim 1 is characterized by: In step S1, the transit trolley is fixed by welding with blocks and steel supports (6) on all sides.

4. The method of construction of shield machine empty push through station in narrow site according to claim 1 is characterized by: In step S2, the length of the site steel plate (9) is 2.5 to 4 times the length of the shield body; and a propulsion reaction seat is welded on the site steel plate (9) every 1.5 to 2.5 m.

5. The construction method of shield machine empty push through station in a narrow site according to claim 1 is characterized by: In step S2, after the transit trolley receives the shield body, the connection between the shield body and the rear supporting equipment and the connecting bridge is disconnected; the connecting bridge is supported and fixed on the segment trolley with a support frame.

6. The method of construction of shield machine empty push through station in narrow site according to claim 1 is characterized by: In step S2, when the tail shield (4) is connected to the middle body, the tail shield (4) and the middle body are welded into one body through steel plates; and both sides of the corbel support seat (10) are reinforced and welded through thick steel plates.

7. The method of construction of shield machine empty push through station in narrow site according to claim 1 is characterized by: The roller (8) is made of round steel with a diameter of 80 mm and a length of 500 mm; the rollers (8) are placed at an interval of 0.5 m.

8. The method of construction of shield machine empty push through station in narrow site according to claim 1 is characterized by: In step S6, when the shield main body is advanced, the track of the supporting equipment is laid, and 4 tracks are set for each supporting section.

9. The method for construction of shield machine empty push through station in a narrow site according to claim 1 is characterized by: In step S7, the total length L1 of the forward advancement distance of the shield trolley assembly is the same as the pulling length L2 of the site steel plate (9); the maximum value of L1 and L2 is the difference between the length of the site steel plate (9) and the shield machine.

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