Method for installing large-size prefabricated parts of internal structure of large-diameter shield tunnel

Abstract

The application discloses a large-diameter shield tunnel internal structure large-size prefabricated part mounting method, the prefabricated part is mounted at the bottom of the tunnel, and the top of the prefabricated part is formed with a space for the horizontal section of the forklift fork to be inserted; the mounting method comprises the following steps: placing a base at the bottom of the mounting area of the prefabricated part in the tunnel, lifting the forklift fork to a high position, and placing the prefabricated part on the horizontal section of the forklift fork through the top space; transporting the prefabricated part to above the mounting area by the forklift, lowering the forklift fork until the bottom of the prefabricated part is placed on the base; mounting a C-shaped lifting tool matched with the top space of the prefabricated part on the forklift fork; matching and mounting the C-shaped lifting tool with the top space of the prefabricated part, lifting the forklift fork to the bottom of the prefabricated part to be separated from the base; removing the base and mounting the prefabricated part in place at the bottom of the mounting area. The application can ensure the safety of internal structure construction and improve the mounting efficiency, and has the characteristics of safety and reliability, high economic efficiency and strong adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel construction, in particular to a large-diameter shield tunnel internal structure large-size prefabricated part installation method. BACKGROUND

[0002] To meet the growing demand for urban underground space development, shield tunnel engineering construction is developing in the direction of super large diameter, super long distance and super deep overburden. Large-diameter shield tunnels are often used in municipal highways and railway transportation, and there is usually a tunnel internal structure construction prefabricated part installation work. However, there is currently no efficient, safe and reliable large-diameter shield tunnel internal structure large-size prefabricated part installation method. SUMMARY

[0003] The purpose of the present application is to provide a large-diameter shield tunnel internal structure large-size prefabricated part installation method that improves installation efficiency while ensuring internal structure construction safety, is safe and reliable, economical and efficient, and has strong adaptability.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A large-diameter shield tunnel internal structure large-size prefabricated part installation method, the prefabricated part is installed at the bottom of the tunnel, and the top of the prefabricated part forms a space for the horizontal section of the forklift fork to insert, the installation method comprising:

[0006] Placing a base at the bottom of the installation area of the prefabricated part in the tunnel, lifting the forklift fork to a high position, and placing the prefabricated part on the horizontal section of the forklift fork through the top space;

[0007] Transporting the prefabricated part to above the installation area by forklift, lowering the forklift fork until the bottom of the prefabricated part is placed on the base, the height of the base is not less than the sum of the maximum lowering height of the forklift fork and the vertical height of the top surface of the prefabricated part from the top of the top space;

[0008] Installing a C-shaped lifting tool matched with the top space of the prefabricated part on the forklift fork, the C-shaped opening direction of the C-shaped lifting tool is opposite to the extension direction of the forklift fork;

[0009] Matching and installing the C-shaped lifting tool with the top space of the prefabricated part, and lifting the forklift fork to the bottom of the prefabricated part to disengage the base;

[0010] Removing the base and installing the prefabricated part in place at the bottom of the installation area;

[0011] The prefabricated part is an arc-shaped member at the bottom of the tunnel, and the arc-shaped member is installed one by one from the tunnel portal to the tunnel using the installation method, and the forklift travels on the top surface of the arc-shaped member that has been installed in place.

[0012] In the embodiment of the present application, the base is a steel base, and the top surface of the steel base is paved with a nylon plate.

[0013] In the embodiment of the present application, the steel base comprises at least two parallel steel beams and a plurality of first connecting rods vertically connected between the at least two parallel steel beams.

[0014] In the embodiment of the present application, the C-shaped lifting tool comprises two C-shaped steel pipes with a rectangular cross section, and the two C-shaped steel pipes are formed with horizontal sleeves matching the top space of the prefabricated part in the direction corresponding to the insertion direction of the horizontal section of the forklift fork.

[0015] In the embodiment of the present application, the end portions of the two C-shaped steel pipes are formed with sleeves for the insertion of the horizontal section of the forklift fork.

[0016] In the embodiment of the present application, the top of the C-shaped lifting tool is provided with a U-shaped ear for the insertion of the horizontal section of the forklift fork.

[0017] In the embodiment of the present application, after the base is withdrawn, a steel cushion block is placed at the bottom of the installation area in advance, and the prefabricated part is installed in place on the steel cushion block.

[0018] In the embodiment of the present application, a small forklift with a tonnage smaller than the forklift is used to withdraw the base in the tunnel.

[0019] The beneficial effects of the present application are: by using the base installed in the tunnel in advance, the approximate installation position of the large-size prefabricated part can be positioned in advance, overcoming the inconvenience of positioning after the large-size prefabricated part formally enters, on the other hand, the height of the base can also compensate for the embarrassing problem that the forklift fork cannot be placed to the bottom of the safe area in the tunnel even if it is lowered to the maximum lowering height due to the excessive height of the prefabricated part, the forklift transports the prefabricated part to the position, then lowers it to the base, and then uses the C-shaped lifting tool to lift the prefabricated part, withdraws the base, and finally installs the prefabricated part in place. Realize the underground one-time positioning and installation of large-diameter shield internal structure large-size and large-quality prefabricated components, safe, economical and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figures 1-3 The construction step diagram of the large-diameter shield tunnel internal structure large-size prefabricated part installation method provided in the embodiment of the present application.

[0022] Figure 4 Front view of the base provided by the embodiment of the present application.

[0023] Figure 5 Top view of the base provided by the embodiment of the present application.

[0024] Figure 6 Front view of the C-shaped lifting tool provided by the embodiment of the present application.

[0025] Figure 7 Top view of the C-shaped lifting tool provided by the embodiment of the present application.

[0026] Figure 8 Side view of the C-shaped lifting tool provided by the embodiment of the present application.

[0027] Figure 9 Illustration of the installation of the base in the tunnel.

[0028] Figure 10 Illustration of the installation of the arc-shaped member in the tunnel.

[0029] Figure annotation: 1-arc-shaped member; 2-base; 3-large forklift (35T); 4-fork; 5-top space of the arc-shaped member; 6-small forklift (5T); 7-C-shaped lifting tool; 8-C-shaped steel pipe; 9-U-shaped lug; 10-parallel steel beam; 11-first connecting rod; 12-second connecting rod; 13-steel cushion block. DETAILED DESCRIPTION

[0030] The specific embodiments of the present application will be further described below with reference to the accompanying drawings. It should be noted that the description of the embodiments is used to help understand the present application and does not constitute a limitation of the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0031] Firstly referring to Figures 1-3 the drawing, the embodiment of the present application provides a large-diameter shield tunnel internal structure large-size prefabricated part installation method. The large-size prefabricated part in the embodiment is an arc-shaped member 1 at the bottom of the tunnel. The arc-shaped member 1 is installed in the tunnel from the tunnel opening one by one by using the installation method of the present application, and the forklift runs on the top surface of the arc-shaped member 1 that has been installed and positioned. The arc-shaped member 1 is installed at the bottom of the tunnel, and the top of the prefabricated part forms a space for the horizontal section of the forklift fork to be inserted. The installation method of the present application specifically includes the following steps:

[0032] First step: placing the base 2 at the bottom of the installation area of the tunnel inner arc-shaped component 1, lifting the forks 4 in front of the forklift 3 to the high position, placing the arc-shaped component 1 through its top space on the horizontal section at the bottom of the forks 4 in front of the large forklift (35T) 3, and tightly fitting the upper surface of the horizontal section of the forks 4 with the upper surface of the top space of the arc-shaped component 1, as shown in Figure 1 .

[0033] Second step: transporting the prefabricated component to the installation area above by the large forklift (35T) 3, and walking the large forklift (35T) 3 on the upper surface of the arc-shaped component 1 that has been installed in place and the ground outside the tunnel, after the large forklift (35T) 3 is in place, slowly lowering the forks 4 of the large forklift (35T) 3 so that the bottom of the arc-shaped component 1 is placed on the upper surface of the base 2, as shown in Figure 2 .

[0034] The base 2 can be a steel base, and in order not to damage the concrete arc-shaped component 1, a layer of nylon plate can be laid on the upper surface of the steel base to contact the concrete arc-shaped component 1.

[0035] As shown in Figure 4 , Figure 5 and Figure 9 , the steel base includes at least two parallel steel beams 10 and a plurality of first connecting rods 11 vertically connected between the at least two parallel steel beams 10. The top surface of the parallel steel beam 10 is shaped to fit the arc of the arc-shaped component 1, and a nylon plate is arranged on the top surface of the parallel steel beam 10.

[0036] The base 2 can play a role in pre-positioning the installation position of the arc-shaped component 1, because the mass and size of the arc-shaped component 1 are large, if positioning is performed when entering the installation site, there will be many inconveniences, such as the forklift loaded with the huge arc-shaped component 1 is not convenient to turn direction and adjust position, if there is a base 2, a more accurate installation position of the arc-shaped component 1 can be pre-marked, and a straight walking route can be marked, the forklift only needs to load the arc-shaped component 1 and move to the top of the base 2 at the bottom of the installation area along the straight walking route, which is convenient for positioning the arc-shaped component 1.

[0037] On the other hand, the height of the base 2 can also compensate for the problem that the forklift forks cannot place the bottom of the arc-shaped member 1 to the bottom of the safe area in the tunnel due to the excessive height of the arc-shaped member 1, because the lifting and lowering of the forklift forks are limited, and when the depth of the installation area bottom exceeds the maximum lowering capability of the forks, a gap between the arc-shaped member 1 and the installation area bottom is inevitably left even if the forks are lowered to the lowest position, resulting in the failure of installation of the arc-shaped member 1. Therefore, the height of the base 2 can compensate for the height of the gap. In theory, the height of the base 2 should not be less than the sum of the maximum lowering height of the forklift forks and the vertical height of the top surface of the arc-shaped member 1 from the top space. Specifically, when designing the size of the base 2, the size of the arc-shaped member 1 is considered according to the type of forklift, and generally, the height of the base 2 is not less than the sum of the maximum lowering height of the forklift forks and the vertical height of the top surface of the arc-shaped member 1 from the top space. Among them, the maximum lowering height of the forklift forks is the vertical height of the upper surface of the horizontal section of the forks 4 from the forklift running base (i.e. the upper surface of the arc-shaped member 1 installed in place or the ground outside the tunnel in the embodiment).

[0038] Step 3: Install a C-shaped lifting tool 7 matched with the top space of the arc-shaped member 1 on the forks 4 of the large forklift (35T) 3 to lift the arc-shaped member 1 on the base 2;

[0039] Cooperation Figures 6-8 As shown, the C-shaped lifting tool 7 includes two C-shaped steel pipes 8 with a rectangular cross section, and the two C-shaped steel pipes 8 are formed with horizontal sleeves matched with the top space of the prefabricated member in the direction corresponding to the insertion of the horizontal section of the forklift forks. In use, the horizontal sleeves are inserted from the front of the arc-shaped member 1, the top surface of the horizontal sleeve is attached to the upper surface of the arc-shaped member 1, and the bottom surface of the horizontal sleeve is attached to the top surface of the top space of the arc-shaped member 1, so as to assemble the C-shaped lifting tool 7 on the arc-shaped member 1.

[0040] Further, the end of the two C-shaped steel pipes 8 forms a socket for the insertion of the horizontal section of the forklift forks, and the socket is in communication with the internal space of the C-shaped steel pipe 8, so that the horizontal section of the forklift forks can be directly inserted into the C-shaped steel pipe 8 located above through the end socket, thereby installing the C-shaped lifting tool 7 on the forklift.

[0041] In another preferred embodiment, a U-shaped hanging ear 9 can also be welded on the top of the two C-shaped steel pipes 8 of the C-shaped lifting tool 7, and the U-shaped hanging ear 9 is welded on the two sides of the C-shaped steel pipe 8 located above with the opening downward, forming a strip sleeve with the top surface of the C-shaped steel pipe 8, for the insertion of the horizontal section of the forklift forks, instead of the above-mentioned scheme of directly inserting the horizontal section of the forklift forks into the C-shaped steel pipe 8, which can also achieve the installation of the C-shaped lifting tool 7 to the forklift. The number of U-shaped hanging ears 9 can be one or more, which can be set according to the need of lifting strength.

[0042] Fourth step: match and install the C-shaped lifting tool 7 with the top space of the arc-shaped component 1, and lift the forklift fork to the bottom of the arc-shaped component 1 to be separated from the lower steel base, as shown in Figure 3

[0043] Because the mass and size of the arc-shaped component 1 are large, it is not convenient to directly use the C-shaped lifting tool 7 to clamp the arc-shaped component 1 in the forklift transportation process, which is easy to cause imbalance, so in the transportation structure of the arc-shaped component 1, the arc-shaped component 1 is directly placed on the fork of the forklift, which is beneficial to ensure the stability of the arc-shaped component 1 in the transportation process.

[0044] But when lifting the arc-shaped component 1 to separate it from the lower steel base, the arc-shaped component 1 only moves up and down at this time, without horizontal displacement, so the C-shaped lifting tool 7 can be used to indirectly install the arc-shaped component 1, and during this period, the large forklift can return to continue loading the next arc-shaped component, without affecting the current construction, which is beneficial to improve the construction efficiency (the number of forklifts is not one).

[0045] Fifth step: remove the base 2, place a steel cushion block 13 at the bottom of the installation area, and then install the arc-shaped component 1 on the steel cushion block 13, as shown in Figure 3 and Figure 10 .

[0046] In this step, a small forklift (5T) 6 can be used to place the steel base at the bottom of the small forklift (5T) 6 fork horizontal section, and the steel base is removed from the installation area away from the arc-shaped component 1. Then install a steel cushion block 13 at the bottom of the installation area. The steel cushion block 13 is a small cushion block that needs to be set at the bottom of the arc-shaped component 1 to adapt to the shape of the tunnel.

[0047] The present application provides a large-diameter shield tunnel internal structure large-size prefabricated part installation method, which can ensure the safety of internal structure construction while improving the installation efficiency, and has the characteristics of safety and reliability, economic efficiency, and strong adaptability. Specifically, the present application uses a pre-installed base in the tunnel to pre-position the approximate installation position of the large-size prefabricated part, overcoming the inconvenience of positioning after the large-size prefabricated part enters the site, and on the other hand, the height of the base can also compensate for the problem that the forklift fork cannot be placed on the bottom of the safe area in the tunnel due to the excessive height of the prefabricated part. After the forklift transports the prefabricated part into position, it can be lowered onto the base first, and then the C-shaped lifting tool is used to lift the prefabricated part. After the base is removed, the prefabricated part is finally installed in place. The large-diameter shield internal structure large-size, large-mass prefabricated component is positioned and installed in one time in the well, which is safe, economical and efficient.

[0048] ​The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the described embodiments. Various changes, modifications, replacements, and variations of the embodiments can be made by those skilled in the art without departing from the principles and spirit of the present application, and still fall within the scope of the present application.

Claims

1. A method for installing large-sized prefabricated components for the internal structure of a large-diameter shield tunnel, wherein the prefabricated components are installed at the bottom of the tunnel and the top of the prefabricated components forms a space for the horizontal section of a forklift fork to insert, characterized in that... The installation method includes: A base is placed at the bottom of the installation area of ​​the prefabricated component inside the tunnel. The forklift forks are raised to a high position, and the prefabricated component is placed on the horizontal section of the forklift forks through the top space. The prefabricated component is transported to the area above the installation area by a forklift. The forklift forks are lowered until the bottom of the prefabricated component is placed on the base. The height of the base is not less than the maximum lowering height of the forklift forks plus the vertical height of the top surface of the prefabricated component from the top surface of its top space. A C-shaped lifting device is installed on the forklift fork to match the top space of the prefabricated component, wherein the C-shaped opening of the C-shaped lifting device is opposite to the extension direction of the forklift fork; The C-type lifting device is matched and installed with the top space of the prefabricated component, and the forklift forks are lifted to the bottom of the prefabricated component and detached from the base; Remove the base and install the prefabricated component in place at the bottom of the installation area; The prefabricated component is an arc-shaped component at the bottom of the tunnel. The arc-shaped component is installed one by one from the tunnel entrance into the tunnel using the installation method described above. The forklift travels on the top surface of the installed arc-shaped component.

2. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, The base is a steel base, and the top surface of the steel base is covered with a nylon plate.

3. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 2, characterized in that, The steel base includes at least two parallel steel beams and multiple first connecting rods vertically connected between the at least two parallel steel beams.

4. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, The C-shaped lifting device includes two C-shaped steel pipes with a rectangular cross-section. The two C-shaped steel pipes are formed with horizontal sleeves that match the top space of the prefabricated component, corresponding to the direction in which the horizontal section of the forklift forks is inserted.

5. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 4, characterized in that, The ends of the two C-shaped steel pipes form slots for inserting the horizontal section of the forklift forks.

6. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, The top of the C-type spreader is equipped with a U-shaped lug for inserting the horizontal section of the forklift forks.

7. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, After removing the base, steel pads are placed at the bottom of the installation area before the prefabricated component is installed on the steel pads.

8. The method for installing large-size prefabricated components of the internal structure of a large-diameter shield tunnel according to claim 1, characterized in that, Inside the tunnel, a small forklift with a tonnage smaller than the forklift was used to remove the base.

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