External traction low gravity center steel lining transport trolley

Abstract

The utility model discloses a kind of outer traction low gravity center steel lining transport trolley, by running steel wheel, trolley frame, support seat and traction device constitute;The trolley frame includes two main walking beams and connecting beam, main walking beam is by two channel steel web back-to-back with steel plate group welding into box girder, connecting beam adopts I-beam and main walking beam welding.This trolley changes its structure, reduces the gravity center of transport equipment;Satisfy the size smaller condition of diversion tunnel excavation support;According to the elevation of steel lining installation, the support seat of transport trolley is designed specifically, can speed up installation efficiency, become a kind of multifunctional steel lining transport trolley, finally satisfy diversion tunnel steel lining transport installation task.

Description

Technical Field

[0001] This utility model relates to the field of water diversion tunnel construction technology in the hydropower industry, and in particular to an externally traction low center of gravity steel lining transport trolley. Background Technology

[0002] After the excavation and support of the hydropower station's water diversion tunnel were completed, the work was transferred to the steel lining installation face. Before transporting and installing the steel lining, a space survey of the tunnel corridor was conducted. The survey revealed that although the civil engineering team had considered the impact of the tunnel's cross-sectional space and turning radius on later equipment transportation in the early stages of the excavation design, over-excavation or under-excavation frequently occurred during the actual excavation process. Analysis of the data from the under-excavated sections of the tunnel, which were already excavated and supported, showed that as long as the space limit for steel lining installation could be met, the removal of the supporting steel sections and re-excavation and support should be avoided as much as possible. Removing and re-excavating the under-excavated sections not only poses significant safety hazards but also greatly affects the overall construction progress; therefore, it is necessary to design an externally traction, low-center-of-gravity steel lining transport trolley to solve these problems. Summary of the Invention

[0003] The technical problem this utility model aims to solve is to provide an externally traction, low-center-of-gravity steel lining transport trolley, specifically targeting unconventional transportation solutions for steel linings in water diversion tunnels in the hydropower industry. By laying square steel tracks in confined spaces and employing a low-center-of-gravity steel lining transport trolley, the challenges of space constraints and easy overturning during the transportation of large steel linings in water diversion tunnels are solved. A specially designed externally traction, low-center-of-gravity steel lining transport trolley is employed: this trolley lowers the center of gravity of the transport equipment by modifying its structure; it meets the requirement of relatively small dimensions for excavation and support in water diversion tunnels; and the trolley support base is specifically designed according to the steel lining installation elevation, which accelerates installation efficiency, making it a multi-functional steel lining transport trolley that ultimately meets the transportation and installation requirements of steel linings in water diversion tunnels.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An externally traction low-center-of-gravity steel-lined transport trolley consists of running steel wheels, a trolley frame, a support base, and a traction device. The trolley frame includes two main traveling beams and a connecting beam. The main traveling beams are box beams formed by welding two channel steel webs back-to-back with steel plates. The connecting beams are made of I-beams welded to the main traveling beams.

[0005] Preferably, the traction device includes a winch, a wire rope, and a shackle, and is connected to the trolley via a lug plate.

[0006] Preferably, the running steel wheels travel on square steel tracks, and the structure of the steel wheels embedded in the box girder reduces the transport height.

[0007] Preferably, a rubber pad is laid on the arc plate of the support base.

[0008] Preferably, the winch of the traction device is equipped with a guide wheel.

[0009] Preferably, the running steel wheels are double-flanged steel wheels, with two steel wheels symmetrically installed on each main traveling beam and embedded inside the box girder.

[0010] Preferably, the support base is a welded steel plate assembly, with two bases placed on each main traveling beam, and is detachably connected to the main traveling beam by bolts.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The device is simple in structure, easy to manufacture, low in cost, and highly practical. Through practical verification, it has solved the problem that the steel lining cannot be transported through the cross section of the water diversion tunnel due to under-excavation. At the same time, the device also meets the purpose of rapid installation after the steel lining is transported to the work site, which speeds up the construction progress, ensures the construction quality, and can create good economic benefits and social value. Attached Figure Description

[0012] Figure 1 This is a top view of the steel-lined transport trolley of this utility model. Figure 2 This is a schematic front sectional view of the steel-lined transport trolley of this utility model; Figure 3 This is a side view of the trolley transport steel liner of this utility model; Figure 4 This is a front view schematic diagram of the trolley transport steel liner of this utility model; In the diagram, 1 is the running steel wheel, 2 is the trolley frame, 3 is the support seat, 4 is the traction device, 5 is the main traveling beam, 6 is the connecting beam, 7 is the I-beam, 8 is the steel plate, 9 is the water diversion tunnel, and 10 is the steel lining. Detailed Implementation

[0013] Example 1: like Figures 1-4 As shown, an externally traction low-center-of-gravity steel-lined transport trolley 10 is composed of running steel wheels 1, trolley frame 2, support seat 3 and traction device 4; the trolley frame 2 includes two main traveling beams 5 and a connecting beam 6. The main traveling beams 5 are box beams formed by welding two channel steel webs back to back with steel plates 8. The connecting beams 6 are made of I-beams 7 and welded to the main traveling beams 5.

[0014] Preferably, the traction device 4 includes a winch, a wire rope, and a shackle, and is connected to the trolley via a lug plate.

[0015] Preferably, the running steel wheel 1 travels on a square steel track, and the structure of the steel wheel embedded in the box girder reduces the transport height.

[0016] Preferably, a rubber pad is laid on the arc plate of the support base 3.

[0017] Preferably, the winch of the traction device 4 is equipped with a guide wheel.

[0018] Preferably, the running steel wheel 1 is a double-flanged steel wheel, and two steel wheels are symmetrically installed on each main traveling beam 5 and embedded in the box girder.

[0019] Preferably, the support base 3 is a welded steel plate of 8 groups, with 2 units placed on each main traveling beam 5, and detachably connected to the main traveling beam 5 by bolts.

[0020] Example 2: The main functions of the external traction low center of gravity steel lining transport trolley designed in this utility model are: to reduce the center of gravity of the transported steel lining 10 by changing the arrangement of the running steel wheels 1 and laying the track, thereby reducing the risk of overturning during transport; to enable the transported steel lining 10 to pass through the area with the minimum installation excavation support section; and to meet the purpose of rapid installation of the steel lining 10 by designing the detachable support seat 3 on the trolley.

[0021] Furthermore, the low center of gravity steel-lined 10 transport trolley is manufactured in strict accordance with the design drawings and relevant technical specifications. All welds are inspected by magnetic particle or dye penetrant testing. The trolley can only be put into use after the entire process is completed and accepted by a structural engineer or technician.

[0022] Two 40×40mm square steel rails are laid along the bottom of the water diversion tunnel 9 and firmly fixed to the ground. The two rails are symmetrically arranged on both sides of the ground with the center of the tunnel as the reference, with a distance of 2.8m between them, and the height difference of the same section of the rails does not exceed 5mm.

[0023] Place the steel liner 10 lifting device onto the transport trolley. Beforehand, lay an 8mm rubber pad on the arc plate of the transport trolley support base 3 to prevent direct contact between the outer wall of the steel liner 10 and the arc plate of the support base 3, which could damage the anti-corrosion paint. Re-inspect and confirm the spatial dimensions of the steel liner 10 placed on the transport trolley and the cross-sectional dimensions of the water diversion tunnel 9. Once confirmed that there are no risks of scratches or collisions, the transport can proceed.

[0024] The steel liner 10 has an inner diameter of Ø5.8m, a wall thickness of 14mm, a maximum external geometric dimension of Ø6.128m (including the stiffening ring), a length of 6m, and a total weight of 13.8t; the transport trolley itself weighs 1.9t, for a total of 15.7t. The rolling friction coefficient between the steel wheels and the rails is 0.05cm, and the frictional resistance is approximately 1t. Therefore, two 5t shackles are used to connect to the lugs on the transport trolley, and Ø18mm steel wire ropes are used as traction ropes. A 2t high-speed winch is used as the driving force to directly pull the steel liner 10 to the installation position via the transport trolley.

[0025] After the steel liner 10 is transported to the installation site, jacks can be directly set up on the ground to lift the entire steel liner 10 by 37mm, which is the permanent installation elevation of the steel liner 10. The small lifting height, coupled with the transport trolley positioned below the steel liner 10 to protect construction personnel, significantly reduces safety hazards and achieves rapid installation. Once the steel liner 10 is lifted and temporarily secured, the transport trolley can be removed. The prerequisite for removing the transport trolley is to first remove the bolts of the support base 3 and move the support base 3 off the transport trolley; otherwise, the stiffening ring of the steel liner 10 will obstruct the support base 3, preventing the trolley from being removed smoothly.

[0026] Once in place, the steel liner 10 can be finely adjusted in terms of elevation and axis according to design requirements, and then the pressure steel liner 10 can be constructed in sequence, including pressing, welding, flaw detection, and corrosion protection.

[0027] Following this pattern, the transportation and installation of all steel liners 10 can be completed step by step through the above operational steps. The manufacturing height of the support base 3 on the transport trolley depends on the installation elevation of different water diversion tunnels 9 and the excavation support section.

Claims

1. A low-center-of-gravity steel-lined transport trolley with external traction, characterized in that: It consists of running steel wheels, a trolley frame, a support base, and a traction device; the trolley frame includes two main traveling beams and a connecting beam. The main traveling beams are box beams formed by welding two channel steel webs back to back with steel plates, and the connecting beams are made of I-beams welded to the main traveling beams.

2. The externally traction low-center-of-gravity steel-lined transport trolley according to claim 1, characterized in that: The traction device includes a winch, a wire rope, and a shackle, and is connected to the trolley via a lug plate.

3. The externally traction low-center-of-gravity steel-lined transport trolley according to claim 1, characterized in that: The running steel wheels travel on square steel tracks, and the structure of the steel wheels embedded in the box girder reduces the transport height.

4. The externally traction low-center-of-gravity steel-lined transport trolley according to claim 1, characterized in that: A rubber pad is laid on the arc plate of the support base.

5. The externally traction low-center-of-gravity steel-lined transport trolley according to claim 1, characterized in that: The winch of the traction device is equipped with guide wheels.

6. The externally traction low-center-of-gravity steel-lined transport trolley according to claim 1, characterized in that: The running steel wheels are double-flanged steel wheels, with two steel wheels symmetrically installed on each main traveling beam and embedded in the box girder.

7. The externally traction low-center-of-gravity steel-lined transport trolley according to claim 1, characterized in that: The support base is a welded steel plate assembly, with two bases placed on each main traveling beam, and is detachably connected to the main traveling beam by bolts.

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