SU1583710A1 - Method and apparatus for constructing a secondary lining in tunnel - Google Patents

Abstract

The invention relates to underground construction, and in particular to methods for the erection of secondary finishing in tunnels. It eliminates the axial imbalance of the formwork and improves the quality of the erected finish by increasing the discharge pressure. In a tunnel with a primary finish 1, a set of two self-propelled formwork 2, 3 is placed, the first of which is the previous one, and the second - the next. Concrete entry through one using the first formwork. The postural space is overlapped with removable mechanical seal girders. Concrete is supplied through the concrete line. Axial shifting of formwork 2 from one stopping to another is done after the concrete has hardened. The step of shifting exceeds the own length of formwork 2 by the length of the interval between entries. The interval between the inlets is less than the length of the second formwork 3 by an amount sufficient to support the end sections of the formwork 3. The formwork 3 is moved through the tunnel after the formwork 2, cover its interval and concretes it. Formwork 3 set, based on the end sections of the previously concreted entries. Removable end seals on formwork 3 do not install. To hold the mortar, end surfaces 10, 11 of previously concreted inlets are used. Concreting of the formwork 3, 2 is carried out with a small gap in time from one concrete pump. The formwork 2, 3 consists of hinged-folding segments, a folding mechanism, a transport bridge, a curved end faceplate, and compensation pads along the outer surfaces of the segments. The thickness of the front lining exceeds the thickness of the rear. This allows formwork 2, 3 to be used separately. 2 sec. f-ly, 3 ill.

Description

The invention relates to underground construction, in particular to methods for erecting a secondary lining in tunnels, and can be used in urban underground construction.

The purpose of the invention is to eliminate the axial unbalance of formwork, to improve the quality of the lining by increasing the discharge pressure.

FIG. Figure 1 shows the placement of the formwork in the tunnel and the concreting of the previous one, the first formwork of the first approach, the initial position; in fig. 2 — installation of formwork in a tunnel for sequential concreting; in fig. 3 is a view A of FIG. one.

The method is carried out as follows.

In the tunnel with the primary lining 1 place a set of two self-propelled formwork 2 and 3, the first of which the previous

schA, and the second

the following.

In the initial section of the tunnel, the first passes for 4 and 5 are concreted using the first formwork 2, which is installed in stages at each of these entries on the primary lining 1 inside the tunnel. The ends of the bottom-up space of the formwork 2 are overlapped with removable end seal seals b and 7. Concrete is supplied through the concrete line 8 from the concrete pump that is located on the surface or in the mine. The axial movement of the formwork 2 from step 4 to step 5 is made after the concrete has hardened and folded, and the step of shifting exceeds the original length of the first formwork by the length of the interval 9 between steps 4 and 5, which is less than the length of the second formwork 3 supporting the end plots of the second formwork 3.

After hardening of concrete at gate 5, the first formwork 2 is moved through the tunnel to the next stop, leaving the same interval of 9, and the second formwork 3 is moved through the tunnel after the first formwork 2 and is installed on the secondary lining, resting on the end sections of previously cast concrete 4 and 5 steps and overlapping the interval 9 between them. At the same time, removable face sealing bolts 6 and 7 are not installed on the second formwork 3, but to hold the concrete along the ends of its co-fi lling space, use face surfaces 10 and and previously cast concrete 4 and 5. Concreting for the second formwork 3 is performed in intervals 9 between entries 4 and 5, after which they increase the length of the betonovod 8 to the first formwork 2 and concrete its filing space, and then disconnect and wash the concrete flow conduit 8. The specified concreting operations of the filing space are of formwork is performed with a small gap in time from the same concrete pump, so the need for pro

0

5 0 5

5 0 5

interstitial flushing betonovod 8 is missing.

The device for implementing the method consists of two successively installed forms 2 and 3, which include swivel segments 12-16, folding mechanisms 17, transport bridges 18 and 19, removable end seals 6 and 7 and compensation pads 20-22 on the outer surfaces of the segents 12-16. When this compensation pads 20 and 21 are mounted respectively from the front and rear ends of the previous formwork 2, and the lining 22 from the rear end of the subsequent formwork 3. The thickness of the front lining 20 exceeds the thickness of the rear pads 21 and 22.

The second formwork 3 is installed in such a way that its front part without an external compensation pad is placed at gate 5 in the concrete footprint 23 from the rear lining 21 of the first formwork 2, and tail section with plate 22 - at gate 4 in the concrete footprint 24 from the front plate 20 first formwork 2.

After curing with concrete, the end seals 6 and 7 are disassembled, the formwork 2 and 3 are folded using appropriate folding mechanisms 17, and both forms are moved using transport bridges 18 and 19, which allow the formwork to be moved both forward and backward. the next step of concreting, opening and installation of both formwork in new entries. The pads 20-22 compensate for the accuracy of the manufacture of cross sections of the front and rear ends of each formwork, as well as the first and second formwork one relative to the other.

Exceeding the cross section of each formwork on the side of one of their ends compared to the size of the other end, achieved by installing compensation linings 20-22, allows, if necessary, to use the formwork separately by a known method while continuing to concrete the secondary lining only with the previous formwork 2 after bringing the subsequent formwork 3 back into the shaft for repair.

The application of the proposed method allows to increase the daily rate of erection of the secondary lining in the tunnel and to increase the efficiency of using the concrete pump, as well as eliminating the axial unbalance of both forms at the time of concrete casting, which increases the pressure of concrete and improves the quality of the finished lining additional vibrating concrete.

Claims (2)

1. A method of erecting a secondary lining in a tunnel, including the installation of two forms, overlapping the ends of the formwork spaces of each formwork, alternating concreting with a single concrete pump, folding the forms after hardening the concrete and moving them to the next entry different from that in order to eliminate axial imbalance formwork and improving the quality of lining by increasing the discharge pressure; each subsequent entry is concrete-cast alternately with different formwork, the first one being installed at intervals of m smaller than the length of the second, and the second overlap this interval and install it on the end sections of the entries, concreted with the first formwork. 2. A device for erecting a secondary lining in a tunnel, consisting of two successively installed self-propelled formwork with articulated folding segments, a folding mechanism, transport bridges, removable faceplates and compensatory linings on the outer surfaces of the segments, characterized by the fact that the first formwork equipped with compensation plates from the front and rear ends, and the second - from the rear, while the thickness of the front lining exceeds the thickness of the rear. 20 tt 12 U 2 15 13 2l “ FIG. 2 dida 1U 18 24 20 I P nineteen / 16 years 21