JP3697953B2 - Concrete placement control device and concrete placement method using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete placement control device and a concrete placement method using the same, which are used for the purpose of preventing the biased concrete injection to the left or right wall surface in the concrete placement work for forming the tunnel lining body. About.
[0002]
[Prior art]
In general, the tunnel lining body formation work that is carried out in tunnel construction is performed by first performing ground excavation by various excavating heavy equipment and blasting work, then performing concrete spraying work on the excavation wall surface to perform primary lining. It is started by installing a movable tunnel lining formwork called, for example, a centruform, in a form along the tunnel ground wall at an appropriate interval. The centle foam is usually designed exclusively for each tunnel to be constructed, has a cross section adapted to the shape of the tunnel wall surface, and further has a structure in which the foam itself can be divided and moved appropriately in the tunnel cross section direction. It is possible to flexibly cope with various situations, and it is widely used in construction of long-distance large-section tunnels, etc., combined with its mobility that can travel on the rail.
[0003]
Generally, the top of this centle foam (corresponding to the vicinity of the tunnel crown) is provided with an inlet for injecting concrete into the outside of the foam, and a concrete supply pipe connected to a concrete pump or the like is connected to the inlet. The concrete was poured into the secondary lining area between the Centrform and the tunnel primary lining. The concrete that has flowed from the concrete inlet into the secondary lining area outside the centle foam branches off the foam in the direction of the left and right tunnel walls and flows down.
[0004]
The distance between the left and right wall surfaces of the centrfoam and the inner wall surface of the tunnel changes depending on the location, resulting in flaws from the initial assumption due to excessive or insufficient surplus or finishing adjustment during tunnel excavation. A phenomenon occurs in which the amount of concrete flowing down is not equal on the left and right sides of the secondary lining area. Therefore, the phenomenon that the liquid surface position of the concrete filled in the secondary lining area differs depending on the left and right of the cross section of the Centroform due to the diversion of the concrete in the lateral direction of the tunnel wall outside the Centroform, Differences in concrete filling amount due to liquid level difference may act as excessive side pressure on the centrufoam structure, which may cause undesired situations such as deformation of the centrufoam itself or malfunction of various mechanisms. There was also.
[0005]
Therefore, in the past, the concrete filling situation in the secondary lining area was checked quite frequently, so that there was no bias in the filling amount on the left or right, or the secondary lining area was simply removed from the inspection port etc. It was inserted in and used to manually adjust the amount of branching of the concrete in each direction of the left and right walls in the secondary lining area.
[0006]
[Problems to be solved by the invention]
However, the conventional concrete placement control device and the concrete placement method have the following problems.
That is, as in the past, the concrete filling condition in the secondary lining area is frequently checked, and a plate or the like is simply inserted into the secondary lining area in accordance with the filling condition to control the flow direction. In the secondary lining area, the method of correcting the unevenness of the concrete filling amount in the lateral direction of the tunnel wall is to place a worker near the top of the narrow tunnel, and against such a worker against the concrete pressure. However, it had a problem that forced heavy labor, such as keeping the board.
[0007]
Therefore, the present invention has been made paying attention to such a conventional problem, and the secondary lining region outside the center is easily and surely arranged without allocating personnel in a narrow work environment and forcing heavy labor. The present invention provides a concrete placement control device and a concrete placement method using the same, which enable uniform concrete placement inside.
[0008]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above-mentioned object, and the concrete is placed outside the centr foam arranged at a distance along the inner wall surface of the tunnel via an inlet formed at the center top of the centr foam. A concrete placement control device provided in the vicinity of the injection port during a concrete placement operation for forming a tunnel lining body by pouring at least one of the left and right sides of the injection port and standing outward from the centruform. One or a plurality of dam-like bodies are provided, and the dam-like bodies are pin-like bodies that can be moved in and out in the tunnel radial direction .
[0010]
According to another aspect of the present invention, the concrete placement is performed by appropriately erecting the weirs included in the concrete placement control device in order to control the direction of the concrete flow outside the center form.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view showing a concrete placing control device 10 of the present invention.
[0012]
In the figure, the upper part of the drawing is a tunnel ground G, which is the actual ground for tunnel construction. This tunnel ground G is blasted or excavated using various excavating heavy machinery, etc., and the concrete is sprayed concrete with the NATM method on the wall surface as primary lining F. The top cross section about the tunnel depth direction of an arch part is shown. The state shown in this figure has already been partially laid with arch concrete as a secondary lining body, and continues as an existing arch portion 11 while appropriately overlapping with the centruform 12 currently being constructed.
[0013]
The space between the centruform 12 and the natural ground G behind the existing arch portion 11 (to the right of the paper surface) is a construction arch portion 13 that is planned to be formed continuously with the existing arch portion 11. An inlet 14 for pouring concrete is provided at the top of the centr foam 12 arranged in the construction arch 13, and a concrete supply pipe 15 connected to a concrete pump (not shown) is provided in the inlet 14. Is connected.
[0014]
The concrete C that has been pressure-fed through the concrete supply pipe 15 passes through the inlet 14 and flows into the construction arch portion 13 above the centruform 12. In the present invention, the concrete placement control device 10 is attached in the vicinity of the inlet 14 provided in the centruform 12. The concrete placement control apparatus 10 includes, for example, a plurality of pin-like bodies 10a (as dam-like bodies) arranged in parallel at appropriate intervals on both the left and right sides when viewed from the tunnel cross section centered on the inlet 14. The pin-shaped body 10a is locked and fixed so as to be freely withdrawn / retracted by inserting / removing the locking pin 10c to / from the centruform 12 via the plate 10b.
[0015]
The concrete C injected from the injection port 14 squirts from the injection port 14 toward the tunnel ground G as shown in FIG. The construction arch 13 is filled with the flow Cr and the left branch flow Cl. At this time, for example, if the right half of the construction arch portion 13 is found to be unevenly filled with the concrete C, the right column among the pin-like bodies 10a included in the concrete placing control device 10 of the present invention is selected. By inserting and standing above the foam 12 to properly block the right branch flow Cr and strengthen the left branch flow Cl, the uneven concrete filling situation is eliminated and the uniform concrete filling situation in the construction arch part 13 is maintained. Secure.
[0016]
As described above, the pin-like body 10a is inserted and locked toward the top of the centruform 12 according to various situations, so that an arbitrary branch flow is appropriately prevented and the filling state in the construction arch portion 13 of the concrete C is prevented. As shown in FIG. 2, when the pin-shaped body 10a is actually inserted into and removed from the centruform 12, a hammer is applied to the support portion 10d that serves as a base point for pulling out and inserting the pin-shaped body 10a. Using a variety of tools, such as human power, or using an electric motor or the like, a pulling force or insertion force is applied to slide a predetermined length, and on the other hand, the pin-like body 10a is securely locked or removed. Therefore, the locking pin 10c is inserted into or removed from the locking hole 10e provided in the main body of the pin-shaped body 10a.
[0017]
FIG. 3 shows a centruform 12 to which the concrete placing control device 10 of the present invention is applied. A procedure for placing and forming a tunnel lining body using this centruform 12 will be described below. The centru foam 12 installed in the tunnel has a foam main body formed by integrating steel plates so as to substantially match the shape of the inner wall surface of the tunnel, a jack J and a ventilating wind pipe F provided therein, and the centru foam 12. It is mainly comprised from the running part M on the rail R which makes it movable.
[0018]
The concrete C supplied from the concrete supply pipe 15 spouts toward the supply port 14 and passes through the gap between the pin-like bodies 10a as the weir-like bodies in the concrete placement control device 10 so that the construction arch above the center 12 It will flow into the part 13. At this time, the inflow amount into the construction arch portion 13 on either the left or right half is controlled by the presence or absence (or the difference in the number) of the pin-like bodies 10a in the right and left rows. While confirming the state of concrete filling into the construction arch part 13 as appropriate, uniform concrete placement is performed regardless of the place by repeating the above work.
[0019]
In this embodiment, the pin-like body 10a is used as the weir-like body in the concrete placing control device 10, but the present invention is not limited to this, and strips, spheres, and other various shapes can be applied.
[0020]
In this embodiment, the pin-like bodies 10a as the weir-like bodies are arranged on both the left and right sides of the injection port 14. However, the present invention is not limited to this. The shape of the weir-like body and the plane arrangement pattern, such as those that are rotated according to the usage, or that are not arranged in parallel but arranged in a ring so that the concrete flow can pass only in any direction Various things can be applied.
[0021]
【The invention's effect】
As described above in detail, the concrete placement control body of the present invention is connected to the outside of the centruform disposed at a distance along the inner wall surface of the tunnel via the injection port formed at the center top of the centlefoam. A concrete placement control device provided in the vicinity of the injection port during the concrete placement operation for injecting concrete to form a tunnel lining body, at least one of the left and right sides of the injection port, One or a plurality of dam-like bodies that stand upright are provided, and the dam-like bodies are pin-like bodies that can be moved in and out in the radial direction of the tunnel .
[0022]
Therefore, it is not necessary to place a worker near the top of a narrow tunnel, and to force such a worker to keep holding the plate against the concrete pressure, and the concrete placement control device of the present invention can be used. Workers who move in and out arbitrarily and reliably according to the concrete placement situation, simply control the flow of concrete injected into the secondary lining area, and finally there will be no unevenness in the filling amount depending on the location Uniform concrete placement can be carried out.
[0023]
Further, the dam-shaped member because a pin-shaped body is freely projecting and retracting the tunnel radially, can worker performs extending and retracting operations of the pin-like member more easily, leading to improvement in workability.
[0024]
Then, if concrete placement is performed by appropriately erecting the weirs provided in the concrete placement control device of the present invention in order to control the direction of the concrete flow in the secondary lining area, the secondary placement as described above is performed. Of course, it is possible to place concrete uniformly regardless of the position in the lining area, and as a result, it is possible to perform efficient concrete placing work, leading to a significant reduction in personnel, equipment and other various costs. It is.
[Brief description of the drawings]
FIG. 1A is an explanatory view showing a concrete placement control device of the present invention, and FIG. 1B is a plan view thereof.
FIG. 2 is an explanatory view showing an example in which the weir-like body in the concrete placement control body of the present invention is a pin-like body, (a) is a state where the pin-like body is not inserted outside the centruform; b) shows the state in which the pin-like body is inserted outside the centruform.
FIG. 3 is an explanatory view showing a centruform to which the concrete placing control device of the present invention is applied.
[Explanation of symbols]
10a Weir-like body, pin-like body 12 Centreform 14 Inlet

Claims (2)

Prepared in the vicinity of the injection port for concrete pouring work by injecting concrete through an injection port formed at the center top of the centruform disposed at a distance along the inner wall surface of the tunnel to form a tunnel lining body A concrete placement control device,
At least one of the left and right sides of the injection port is provided with one or a plurality of weirs that stand outward from the centruform,
The weir-like body is a pin-like body that can freely move in and out of the tunnel radial direction.
A concrete placement control device characterized by that. A concrete placement method characterized in that concrete placement is performed by appropriately erecting the weirs provided in the concrete placement control device according to claim 1 to control the direction of the concrete flow outside the center form.

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