A model of cast-in-situ internal structure of a shield tunnel and its experimental production method

Abstract

The present invention provides a model of a cast-in-place internal structure of a shield tunnel, comprising two model fixtures, a first aluminum sheet, a second aluminum sheet, a third aluminum sheet, a fourth aluminum sheet, a Π-shaped plate, and a tensioning device with a pre-tightening force, wherein the model fixture is semi-arc-shaped, and three holes are provided on the model fixture, and the three holes are arranged side by side, and the two model fixtures are directly opposite and spaced in the vertical direction, and the two ends of the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet are respectively engaged with the three holes of the two model fixtures, and along the circumference direction of the outer edge of the model fixture, the fourth aluminum sheet covers the two model fixtures, and the two ends of the Π-shaped plate are respectively connected to the two ends of the fourth aluminum sheet, and the Π-shaped plate is arranged in affixed to the two model fixtures, and the Π-shaped plate and the fourth aluminum sheet completely enclose the two model fixtures, and the tensioning device is wrapped around the outside of the Π-shaped plate and the fourth aluminum sheet. The present invention also provides a model test production method for a cast-in-place internal structure of a shield tunnel.

Description

Technical Field

[0001] The invention relates to the field of cast-in-situ internal structures of shield tunnels, and in particular to a model of a cast-in-situ internal structure of a shield tunnel and a test manufacturing method thereof. Background Art

[0002] With the development of large-diameter shield tunnel construction technology, multi-layer shield tunnels have shown a trend of development and have become the construction target of many urban traffic tunnels. The present invention is based on a multi-layer shield tunnel under construction. The tunnel is divided into two layers, the upper layer is a highway lane 101, and the lower layer is a rail transit 202. The upper and lower layers are separated by an internal structure 303, as shown in the attached figure. Figure 1 shown.

[0003] The segment lining 404 of the shield tunnel is the force-bearing structure of the shield tunnel. A large number of tests have been conducted to study its force characteristics, but few have considered the mechanical test research of the segment after the internal structure 303 is added. The internal structure 303 of the shield tunnel is usually connected to the segment lining 404 as a whole through methods such as embedding reinforcement and post-casting, and the internal structure 303 can be divided into beam, plate, and column structures, which must have a certain role in bearing force. If the mechanism and principle of the influence of the internal structure 303 on the force of the segment can be explored, then in the future segment design, the force characteristics of the internal structure 303 can be used to improve the design of the segment, thereby reducing the design cost and increasing the safety performance.

[0004] Based on the above background, the study of the internal structure of shield tunnels will become a new research point.

[0005] How to simplify and produce the internal structure model of the shield tunnel, reduce the cost of model production, and speed up the production process has become the research focus. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a model of the cast-in-situ internal structure of a shield tunnel and a test production method thereof. The model structure is simple, the model production cost is reduced, and the production speed is accelerated.

[0007] The present invention is achieved in that:

[0008] The present invention provides a model of a cast-in-place internal structure of a shield tunnel, comprising two model fixing devices, a first aluminum sheet, a second aluminum sheet, a third aluminum sheet, a fourth aluminum sheet, a Π-shaped plate, and a tensioning device with a pre-tightening force, wherein the model fixing device is semi-arc-shaped, and three holes are opened on the model fixing device, and the three holes are arranged side by side, and the two model fixing devices are directly opposite and spaced in the vertical direction, and the first aluminum sheet, the second aluminum sheet and the third aluminum sheet are all columnar structures with openings at both ends, and the two ends of the first aluminum sheet, the second aluminum sheet and the third aluminum sheet are respectively clamped with the three holes of the two model fixing devices, and the first aluminum sheet, the second aluminum sheet and the third aluminum sheet correspond to the three holes one by one, and along the circumference direction of the outer edge of the model fixing device, the fourth aluminum sheet covers the two model fixing devices, the two ends of the Π-shaped plate are respectively connected with the two ends of the fourth aluminum sheet, the Π-shaped plate is arranged in contact with the two model fixing devices, the Π-shaped plate and the fourth aluminum sheet completely enclose the two model fixing devices, and the tensioning device is wrapped around the outside of the Π-shaped plate and the fourth aluminum sheet.

[0009] Preferably, the first aluminum sheet, the second aluminum sheet and the third aluminum sheet are filled with fine sand so that the first aluminum sheet, the second aluminum sheet and the third aluminum sheet can better fit the holes.

[0010] Preferably, there are two tensioning devices, and the two tensioning devices are symmetrically spaced apart in the vertical direction.

[0011] The present invention also provides a model test manufacturing method for the cast-in-place internal structure of a shield tunnel, wherein the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet are bent in the three holes of the model fixing device respectively to make them fit the shapes of the three holes of the model fixing device respectively, a model fixing device is respectively arranged at both ends of the width direction of the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet, and then the entire device is placed on a manufacturing platform along the width direction of the model, the fourth aluminum sheet is bent along the circumference direction of the outer edge of the model fixing device to make it fit the arc edge of the model fixing device, and the Π along the outer edge of the model fixing device is placed on the manufacturing platform along the circumference direction of the outer edge of the model fixing device. A Π-shaped plate is fixed in the mold area, and then a tensioning device with a pre-tightening force is wrapped around the outside of the entire device along the width direction to make it fit tightly to the entire model, so as to maintain the shape of the fourth aluminum sheet and fix the fourth aluminum sheet and the Π-shaped plate together. Then the two model fixing devices are taken out, and the gap at the contact point between the outer bottom of the fourth aluminum sheet and the working plane of the production platform is blocked with plaster. After the plaster on the outside of the fourth aluminum sheet solidifies, plaster is poured in the empty groove area formed by the inner side of the fourth aluminum sheet and the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet. After the plaster in this area solidifies, demolding is completed.

[0012] Preferably, the holes formed by bending the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet are filled with fine sand so that they can better fit the holes of the model fixing device 1 and reduce concave deformation.

[0013] Preferably, two tensioning devices with pre-tightening force are symmetrically wrapped around the outside of the entire device along the width direction.

[0014] The present invention has the following beneficial effects:

[0015] The invention provides a model of the cast-in-situ internal structure of a shield tunnel, which has a simple structure, reduces the model production cost, speeds up the production speed, and provides convenience for the internal structure model test of a multi-layer shield tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of a multi-layer shield tunnel;

[0018] Figure 2 A schematic diagram of a model fixing device provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of fixing the first aluminum sheet, the second aluminum sheet and the third aluminum sheet provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a model of a cast-in-place internal structure of a shield tunnel provided in an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of an internal structure produced by a model provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0025] like Figure 1-Figure 5 , Embodiment 1 of the present invention provides a model of the cast-in-place internal structure of a shield tunnel, comprising two model fixing devices 1, a first aluminum sheet 2, a second aluminum sheet 3, a third aluminum sheet 4, a fourth aluminum sheet 5, a Π-shaped plate 8, and a tensioning device 6 with a pre-tightening force, wherein the model fixing device 1 is semi-arc-shaped, and three holes are opened on the model fixing device 1, and the three holes are arranged side by side, and the two model fixing devices 1 are vertically opposite and spaced apart, and the first aluminum sheet 2, the second aluminum sheet 3 and the third aluminum sheet 4 are all columnar structures with openings at both ends ... The two ends of the three aluminum sheets 4 are respectively engaged with the three holes of the two model fixing devices 1, the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4 correspond to the three holes one by one, and along the circumference direction of the outer edge of the model fixing device 1, the fourth aluminum sheet 5 covers the two model fixing devices 1, and the two ends of the Π-shaped plate 8 are respectively connected to the two ends of the fourth aluminum sheet 5, and the Π-shaped plate 8 is arranged in contact with the two model fixing devices 1, and the Π-shaped plate 8 and the fourth aluminum sheet 5 completely enclose the two model fixing devices 1, and the tensioning device 6 is wrapped around the outside of the Π-shaped plate 8 and the fourth aluminum sheet 5.

[0026] The columns of the first aluminum sheet 2 , the second aluminum sheet 3 , and the third aluminum sheet 4 are filled with fine sand so that the first aluminum sheet 2 , the second aluminum sheet 3 , and the third aluminum sheet 4 can better fit the holes.

[0027] There are two tensioning devices 6, and the two tensioning devices 6 are symmetrically spaced apart in the vertical direction.

[0028] The present invention provides a model of the cast-in-place internal structure of a shield tunnel. The model has a simple structure, reduces the cost of model production, and speeds up production. It provides convenience for model tests of the internal structure of multi-layer shield tunnels, and is easy to explore the stress characteristics of the internal structure in the shield tunnel through model tests, thereby improving the design method of multi-layer shield tunnel segments.

[0029] Embodiment 2 of the present invention provides a model test production method for the cast-in-place internal structure of a shield tunnel, comprising the following steps: bending the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4 in the three holes of the model fixing device 1 respectively, so that they respectively fit the shapes of the three holes of the model fixing device 1, and setting a model fixing device 1 at each end along the width direction (vertical direction in the figure) of the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4, and then placing the entire device on a production platform along the width direction of the model, filling the holes formed by bending the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4 with fine sand to make them better fit the holes of the model fixing device 1 and reduce the concave deformation, and placing the fourth aluminum sheet 5 along the outer edge circumference of the model fixing device 1 The fourth aluminum sheet 5 is bent in the direction to fit the arc edge of the model fixing device 1, a Π-shaped plate 8 is fixed along the Π-shaped area of ​​the outer edge of the model fixing device 1, and two tensioning devices 6 with pre-tightening force are symmetrically wrapped along the width direction on the outside of the entire device to make it tightly fit the entire model, so as to maintain the shape of the fourth aluminum sheet 5 and fix the fourth aluminum sheet 5 and the Π-shaped plate 8 together. Subsequently, the two model fixing devices 1 are taken out, and the gap is blocked with plaster 9 at the contact point between the outer bottom of the fourth aluminum sheet 5 and the working plane of the production platform. After the plaster on the outer side of the fourth aluminum sheet 5 solidifies, plaster 9 is poured in the empty groove area formed by the inner side of the fourth aluminum sheet 5 and the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4. After the plaster 9 in this area solidifies, the model is demoulded to complete the model production.

[0030] The invention proposes a model of a cast-in-situ internal structure of a shield tunnel and a manufacturing method thereof. The method can simply and quickly manufacture a model of the internal structure of the shield tunnel, so as to study the influence of the internal structure on the lateral mechanical properties of the shield tunnel.

[0031] The present invention has the following advantages: firstly, the existing shield tunnel model test schemes do not consider the influence of the internal structure. The present invention proposes the problem of making a multi-layer shield tunnel internal structure model, which provides convenience for the multi-layer shield tunnel internal structure model test; secondly, the production method is simple and the production accuracy is high. The template can be made according to the design drawing, so that the production accuracy can be controlled, the production process is not complicated, the production cost is low, and batch production can be achieved.

[0032] The model of the cast-in-place internal structure of a shield tunnel provided by the present invention comprises a model fixing device 1, a first aluminum sheet 2, a second aluminum sheet 3, a third aluminum sheet 4, a fourth aluminum sheet 5, a tensioning device 6, fine sand, a Π-shaped plate 8, and gypsum 9. The main manufacturing method thereof is:

[0033] The width of each of the first aluminum sheet 2, the second aluminum sheet 3, the third aluminum sheet 4, and the fourth aluminum sheet 5 is the width of the model, but the lengths of the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4 are slightly larger than the perimeters of the left, middle, and right holes of the model fixture 1, respectively, and the length of the fourth aluminum sheet 5 is slightly larger than the perimeter of the outer edge of the model fixture 1. The first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4 are bent in the three holes of the model fixture 1 respectively, so that they fit the shapes of the three holes of the model fixture 1 respectively, and a model fixture 1 is set at each end along the width direction of the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4. Then, the entire device is placed on the production platform along the width direction of the model, and the holes formed by the bending of the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4 are filled with fine sand to make them better fit the holes of the model fixture 1 and reduce the concave deformation. The fourth aluminum sheet 5 is bent along the perimeter direction of the outer edge of the model fixture 1 to fit the arc edge of the model fixture 1. Below the hole of the model fixture 1, a Π-shaped plate 8 is fixed along the Π-shaped area of ​​its outer edge, and then two tensioning devices 6 with pre-tightening force are symmetrically wrapped along the width direction on the outside of the entire device to make it fit tightly to the entire model device, so as to maintain the shape of the fourth aluminum sheet 5 and fix the fourth aluminum sheet 5 and the Π-shaped plate 8 together. Then carefully take out the two model fixtures 1, and use plaster 9 to block the gap at the contact point between the outer bottom of the fourth aluminum sheet 5 and the working plane. After the plaster on the outside of the fourth aluminum sheet 5 solidifies, cast plaster 9 in the empty groove area formed by the inner side of the fourth aluminum sheet 5 and the first aluminum sheet 2, the second aluminum sheet 3, and the third aluminum sheet 4. After the plaster 9 in this area solidifies, demoulding is completed to complete the model production.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A model of the cast-in-place internal structure of a shield tunnel, characterized by: It includes two model fixing devices, a first aluminum sheet, a second aluminum sheet, a third aluminum sheet, a fourth aluminum sheet, The model fixing device is semi-arc-shaped, and three holes are provided on the model fixing device, and the three holes are arranged side by side. The two model fixing devices are directly opposite and spaced in the vertical direction. The first aluminum sheet, the second aluminum sheet and the third aluminum sheet are all columnar structures with openings at both ends. The two ends of the first aluminum sheet, the second aluminum sheet and the third aluminum sheet are respectively connected with the three holes of the two model fixing devices. The first aluminum sheet, the second aluminum sheet and the third aluminum sheet correspond to the three holes one by one. Along the circumference direction of the outer edge of the model fixing device, the fourth aluminum sheet covers the two model fixing devices. The two ends of the template are connected to the two ends of the fourth aluminum sheet respectively. The template is fitted with two model fixing devices, and the The mold plate and the fourth aluminum sheet completely enclose the two model fixing devices, and the tensioning device is wrapped around the The outer side of the mold plate and the fourth aluminum sheet; the first aluminum sheet, the second aluminum sheet and the third aluminum sheet are filled with fine sand to make the first aluminum sheet, the second aluminum sheet and the third aluminum sheet fit the holes better; there are two tensioning devices, and the two tensioning devices are symmetrically spaced in the vertical direction.

2. A method for making a model test of a cast-in-situ internal structure of a shield tunnel, applied to the model of the cast-in-situ internal structure of a shield tunnel as claimed in claim 1, characterized in that: The first aluminum sheet, the second aluminum sheet, and the third aluminum sheet are bent in the three holes of the model fixture respectively to fit the shapes of the three holes of the model fixture respectively, and a model fixture is set at each end along the width direction of the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet. Then the entire device is placed on the production platform along the width direction of the model, and the holes formed by bending the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet are filled with fine sand to better fit the holes of the model fixture and reduce concave deformation. The fourth aluminum sheet is bent along the circumference direction of the outer edge of the model fixture to fit the arc edge of the model fixture. Fixed a piece of area Then, two tensioning devices with pre-tightening force are wrapped around the outside of the entire device along the width direction to make it fit tightly to the entire model, so as to maintain the shape of the fourth aluminum sheet and make the fourth aluminum sheet and The mold plates are fixed together, and then the two model fixing devices are taken out. The gap at the contact point between the outer bottom of the fourth aluminum sheet and the working plane of the production platform is blocked with plaster. After the plaster on the outer side of the fourth aluminum sheet solidifies, plaster is poured in the empty groove area formed by the inner side of the fourth aluminum sheet and the first aluminum sheet, the second aluminum sheet, and the third aluminum sheet. After the plaster in this area solidifies, demolding is performed to complete the model production.

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