Tunnel construction joint grooving construction method

By using the second lining trolley and compressible molding strips of the ring-mounted mold in the tunnel second lining construction, the problems of construction joints, poor linear shape and poor concrete leakage and slurry are solved, and the reliability of construction quality and the simplicity of process are achieved.

CN120026932APending Publication Date: 2025-05-23CHINA RAILWAY NO 2 ENG GROUP CO LTD +1
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Patent Information

Application Number
CN202311567623.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-11-22
Publication Date
2025-05-23

AI Technical Summary

Technical Problem

In the construction of the second lining of the tunnel, due to the construction process, on-site management and untight fit of the formwork, the construction joints are often caused by the problems of mismatch, the linear shape is not beautiful, and the concrete leaks and slurry is not dense. The later groove processing is labor-intensive and the linear shape is difficult to adjust.

Method used

A two-lined trolley with molds mounted on the annular direction and a compressible molding strip are used to form a half groove at the end of the second liner through the mold, and the molding strips are pasted and closely attached to the two-lined trolley roof mold. After pouring concrete, the molding strips are removed to form a target groove.

Benefits of technology

The accurate molding of construction joints is achieved, and the problems of unsightly line shape and the concrete leaking and slurry are not dense. The operation is simple, the tooling can be reused, the new tooling is low, which saves labor and avoids the defects of post-trough processing.

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Abstract

The invention provides a tunnel construction joint grooving construction method. The construction method is realized based on a secondary lining trolley annularly provided with a mold and a forming strip, the mold is fixed at the front end of a top mold of the secondary lining trolley, and the mold has a partial shape of a to-be-formed target groove; the construction method comprises the steps that secondary lining concrete pouring is conducted through a secondary lining trolley, and a half groove is formed in the end of a secondary lining through a mold; the mold is separated from the half groove, a forming strip is pasted in the half groove, the half groove is filled with the forming strip, and part of the forming strip is located outside the half groove; the upper surface of the secondary lining trolley top mold is tightly attached to the lower surface of the forming strip; and next section of secondary lining concrete is poured, the secondary lining trolley and the forming strip are removed after pouring is completed, and a target groove is formed in the position of a secondary lining construction joint. The method is simple and convenient, the newly-added tool cost is low, the construction quality is reliable, and the problems that construction joints are staggered, the line type is not attractive, and concrete slurry leakage is not dense are solved; the trapezoidal groove construction joint can be formed at a time after secondary lining pouring; and the defect of re-joint-cutting treatment of the construction joint is avoided.
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Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a tunnel construction joint grooving construction method. Background Art

[0002] At present, in the construction of the secondary lining of the tunnel, due to many reasons such as construction technology, on-site management, and the loose fit between the end formwork of the lining trolley and the poured section, it usually leads to the occurrence of construction joint misalignment, unsightly lines, and loose concrete leakage. For these undesirable situations, the defects are usually treated with grooves in the later stage. However, groove treatment is labor-intensive and time-consuming, the line shape is difficult to adjust, and there are problems such as high cutting processing costs. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the present invention is to solve the problems of misaligned construction joints, unsightly lines, and loose concrete slurry.

[0004] In order to achieve the above-mentioned object, the present invention provides a tunnel construction joint trenching construction method.

[0005] The construction method is implemented based on a secondary lining trolley and a forming strip on which a mold is circumferentially installed, wherein the mold is fixed at the front end of the secondary lining trolley top mold, the mold has a partial shape of a target groove to be formed, and the forming strip is compressible; the construction may include: using the secondary lining trolley to cast secondary lining concrete, forming a half groove at the end of the secondary lining by the mold; moving the secondary lining trolley to separate the mold from the half groove, pasting the forming strip in the half groove, the forming strip filling the half groove and having a part outside the half groove; moving the secondary lining trolley to make the upper surface of the secondary lining trolley top mold tightly attached to the lower surface of the forming strip; casting the secondary lining concrete; after the casting is completed, removing the secondary lining trolley and removing the forming strip, and forming the target groove at the position of the secondary lining construction joint.

[0006] Alternatively, the target groove may comprise a trapezoidal groove.

[0007] Alternatively, the mold may be a semi-trapezoidal mold. Further, the semi-trapezoidal mold may be an arc-shaped mold, and its cross section may include a right-angled trapezoidal section.

[0008] Optionally, the semi-trapezoidal mold may include an upper base plate, an inclined waist plate, a lower base plate and a longitudinal waist plate connected in sequence, and the cross-section of the structure formed by the four is the right-angled trapezoidal cross-section; wherein the lower base plate is located on the upper surface of the second lining trolley top mold, and one end of the lower base plate is connected to the body of the longitudinal waist plate; the longitudinal waist plate is located outside the second lining trolley top mold, and its inner surface is tightly attached to the front end face of the second lining trolley top mold, and the outer surface can fit with the second lining trolley end mold, and the lower end of the longitudinal waist plate is fixed on the second lining trolley body.

[0009] Alternatively, the trapezoidal groove may be an isosceles trapezoidal groove, and the right-angled trapezoidal cross section may be half of the cross section of the isosceles trapezoidal groove.

[0010] Optionally, the cross section of the profiled strip may be trapezoidal and conform to the shape of the target groove.

[0011] Alternatively, the profiled strip may comprise a rubber strip.

[0012] Optionally, before pouring the next section of secondary lining concrete, the method may further include the step of modifying the cross section of the front end of the secondary lining trolley to meet the linear requirements.

[0013] Optionally, the secondary lining trolley can transmit the vibration received to the mold and the forming strip, so that the concrete at the construction joint vibrates synchronously.

[0014] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0015] (1) The construction method of the present invention is easy to operate, reusable, and has low cost for new tooling.

[0016] (2) The construction quality of the present invention is reliable, and the problems of misaligned construction joints, unsightly lines, and loose concrete slurry are solved.

[0017] (3) The present invention enables the trapezoidal groove construction joint to be formed once after the second lining is poured.

[0018] (4) The present invention saves labor and avoids the defect of re-cutting the construction joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A cross-sectional schematic diagram of the tunnel construction joint trapezoidal groove of the present invention is shown.

[0021] Figure 2 A cross-sectional schematic diagram shows the installation position of the semi-trapezoidal channel steel mold of the present invention.

[0022] Figure 3 A cross-sectional schematic diagram of a trapezoidal rubber strip pasted to a semi-trapezoidal groove of concrete according to the present invention is shown.

[0023] Figure 4 A cross-sectional schematic diagram of the second lining platform top pressure trapezoidal rubber strip of the present invention is shown.

[0024] Figure 5A cross-sectional schematic diagram of the trapezoidal rubber strip of the present invention after being taken out and grooved is shown.

[0025] Figure 6 The actual picture shows the effect of applying the construction method of the present invention.

[0026] Figure 7 A physical picture showing the local effect of applying the construction method of the present invention is shown.

[0027] Description of main reference numerals:

[0028] 11-top mold of the second lining trolley, 12-end mold of the second lining trolley, 13-rear end of the second lining trolley, 14-connecting piece;

[0029] 2-semi-trapezoidal channel steel mold;

[0030] 3- Trapezoidal rubber strip;

[0031] 4-Glue;

[0032] 5- Trapezoidal groove;

[0033] A1-cast second lining section, A2-to-be-cast second lining section, A3-newly-cast second lining section;

[0034] B-Secondary lining construction joint. DETAILED DESCRIPTION

[0035] Hereinafter, the tunnel construction joint grooving construction method of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0036] Exemplary Embodiment 1

[0037] This exemplary embodiment provides a method for constructing trenches in a tunnel construction joint.

[0038] The construction method is implemented based on a secondary lining trolley with a mold installed circumferentially and a compressible forming strip, wherein the mold is fixed at the front end of the top mold of the secondary lining trolley, and the mold has a partial shape of the target groove to be formed.

[0039] The construction may include:

[0040] S1: Use the second lining trolley to pour the second lining concrete, and form a half groove at the end of the second lining through the mold.

[0041] S2: Move the second lining trolley to make the mold separate from the half groove, and stick the molding strip in the half groove. The molding strip fills the half groove and a part of it is located outside the half groove.

[0042] S3: Move the secondary lining trolley so that the upper surface of the top mold of the secondary lining trolley is in close contact with the lower surface of the forming strip;

[0043] S4: Pour the next section of secondary lining concrete.

[0044] S5: After pouring is completed, the secondary lining trolley is removed and the forming strips are removed, and the target groove is formed at the location of the secondary lining construction joint.

[0045] In this embodiment, while performing step S5, a half groove is also formed at the end of the second lining.

[0046] The method further comprises: repeating steps S2 to S5 to perform multi-stage construction.

[0047] In this embodiment, the target groove comprises a trapezoidal groove.

[0048] Further, the target groove may be an isosceles trapezoidal groove.

[0049] In this embodiment, when the target groove is a trapezoidal groove, the model can be a semi-trapezoidal mold, and further, can be a semi-trapezoidal groove steel mold. The semi-trapezoidal mold as a whole can be an arc-shaped mold, and its cross section can include a right-angled trapezoidal cross section. It should be noted that the cross section in exemplary embodiment 1 and the section in exemplary embodiment 2 represent the same meaning.

[0050] As an example of the present invention, the semi-trapezoidal mold may include an upper bottom plate, an oblique waist plate, a lower bottom plate and a longitudinal waist plate connected in sequence, and the cross section of the structure formed by the four is a right-angle trapezoidal cross section. Among them, the lower bottom plate is located on the upper surface of the second lining platform top mold, and one end of the lower bottom plate is connected to the body of the longitudinal waist plate; the longitudinal waist plate is located outside the second lining platform top mold, and its inner surface is closely attached to the front end face of the second lining platform top mold, and the outer surface can fit with the second lining platform end mold, and the lower end of the longitudinal waist plate is fixed to the second lining platform body.

[0051] As another example of the present invention, the semi-trapezoidal mold may include an upper bottom plate, an inclined waist plate, a lower bottom plate and a longitudinal waist plate connected end to end in sequence. The lower bottom plate is fixed on the second lining platform top mold, for example, by welding.

[0052] In the case where the trapezoidal groove is an isosceles trapezoidal groove, the above-mentioned right-angled trapezoidal cross section may be half of the cross section of the isosceles trapezoidal groove.

[0053] In this embodiment, the mold material may be steel, that is, a steel mold, such as a semi-trapezoidal groove steel mold.

[0054] In this embodiment, when the target groove is a trapezoidal groove, the cross section of the forming strip may be trapezoidal and consistent with the shape of the target groove.

[0055] Further, the profiled strip may include a rubber strip, such as a trapezoidal rubber strip.

[0056] In this embodiment, the molding strip can be installed by applying an adhesive, such as solid glue or glue, in the half groove.

[0057] In this embodiment, before pouring the next section of secondary lining concrete, the method may further include the step of: modifying the cross section of the front end of the secondary lining trolley to meet the linear requirements.

[0058] In this embodiment, the secondary lining trolley can transmit the vibration received to the mold and the forming strip, so that the concrete at the construction joint vibrates synchronously.

[0059] Exemplary Embodiment 2

[0060] This exemplary embodiment provides a method for forming a trench in a tunnel construction joint. Figures 1 to 7 The construction method of this exemplary embodiment is further described.

[0061] The innovation of the construction method is: Figure 1 and Figure 2 As shown, a semi-trapezoidal channel steel mold 2 is installed at the front end of the secondary lining trolley. Figure 3 As shown, a trapezoidal rubber strip 3 is installed in the semi-trapezoidal groove at the end of the overlapped end of the cast section at the rear of the secondary lining trolley. The compressibility of the rubber strip solves the problem of misalignment and slurry leakage at the overlapped construction joint of the cast section. Figure 5 As shown, each trapezoidal groove 5 needs two sections of secondary lining concrete to be cast and then formed. In addition, when the secondary lining trolley is vibrated by the vibrating rod and the attached vibrator, the vibration can be transmitted to the Figure 1 The semi-trapezoidal channel steel mold 2 and the trapezoidal rubber strip 3 shown can make the concrete at the construction joint B of the secondary lining vibrate synchronously, thus avoiding the problem of vibration leakage at the construction joint position.

[0062] Specific construction methods include:

[0063] like Figure 1 and Figure 2 As shown, a semi-trapezoidal channel steel mold 2 is installed circumferentially at the end of the secondary lining trolley. The semi-trapezoidal channel steel mold 2 is located on the top mold 11 of the secondary lining trolley and can be close to the end mold 12 of the secondary lining trolley. When the secondary lining concrete is poured, a semi-trapezoidal concrete groove will be formed at the end of the poured secondary lining section A1. Figure 1 and Figure 2 As shown, the semi-trapezoidal channel steel mold 2 can be fixed by a connecting member 14, and the connecting member 14 can include a bolt. As an example, the size of the semi-trapezoidal section (i.e., a right-angled trapezoidal section) of the semi-trapezoidal channel steel mold 2 can be: an upper bottom of 15 mm, a lower bottom of 25 mm, and a height of 40 mm.

[0064] Before pouring the next section of the secondary lining, apply glue 4 in the semi-trapezoidal concrete groove and stick the trapezoidal rubber strip (also called full trapezoidal rubber strip) 3 in the groove. Figure 3 The right side of the trapezoidal rubber strip 3 is the second lining section A2 to be cast, see Figure 1 and Figure 4As an example, the dimensions of the trapezoidal cross section of the trapezoidal rubber strip 3 may be: 30 mm for the bottom edge, 50 mm for the top edge, and 40 mm for the height.

[0065] Move the secondary lining trolley so that the top mold 11 of the secondary lining trolley is in close contact with the trapezoidal rubber strip 3, as shown in FIG. Figure 1 and Figure 4 As shown, the trapezoidal rubber strip 3 can be located above the rear end 13 of the secondary lining trolley; the front end of the trolley steel mold is adjusted (i.e., the cross-section of the front end of the secondary lining trolley is modified) to meet the linear requirements.

[0066] After the second lining trolley formwork is closed and the second lining concrete is poured, Figure 5 As shown, a newly cast second lining section A3 is formed. Move and adjust the posture of the second lining trolley, demould, take out the trapezoidal rubber strip 3, and form a trapezoidal groove 5 (also called a trapezoidal concrete groove) below the second lining construction joint B at the front end of the casting section. The trapezoidal groove is located on the wall of the cast second lining section and there is glue remaining.

[0067] Figure 6 and Figure 7 The actual pictures of the grooves obtained by the construction method of the present invention are respectively shown. Obviously, from the appearance point of view, the grooves obtained by the present invention are beautiful, neat and defect-free.

[0068] Compared with the prior art, the advantages of the tunnel construction joint grooving construction method of the present invention include:

[0069] The present invention plugs rubber strips at the construction joint position during the pouring of the tunnel secondary lining concrete to reduce leakage. According to the rectification requirements of the high-frequency defect problem of the construction joint, the present invention directly forms a trapezoidal groove after the secondary lining concrete is poured, and can ensure that the construction joint concrete is dense. The present invention solves the problems of misalignment of the construction joint, unsightly line shape, and non-dense concrete leakage.

[0070] Although the present invention has been described above in conjunction with the exemplary embodiments and the accompanying drawings, it should be apparent to those skilled in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims

1. A tunnel construction joint grooving method, It is characterized in that The construction method is implemented based on a secondary lining trolley with a mold installed circumferentially and a molding strip, wherein the mold is fixed at the front end of the top mold of the secondary lining trolley, the mold has a partial shape of the target groove to be formed, and the molding strip is compressible; the construction includes: The secondary lining trolley is used to pour the secondary lining concrete, and a half groove is formed at the end of the secondary lining through a mold; Move the secondary lining trolley to make the mold separate from the half groove, and stick the molding strip in the half groove, so that the molding strip fills the half groove and a part of it is outside the half groove; Move the secondary lining trolley so that the upper surface of the top mold of the secondary lining trolley is in close contact with the lower surface of the forming strip; Pour the next section of secondary lining concrete; After pouring is completed, the secondary lining trolley is removed and the forming strips are removed, and the target groove is formed at the location of the secondary lining construction joint.

2. The tunnel construction joint grooving method according to claim 1, It is characterized in that The target groove comprises a trapezoidal groove.

3. The tunnel construction joint grooving method according to claim 2, It is characterized in that The model is a semi-trapezoidal mold.

4. The tunnel construction joint grooving method according to claim 3, It is characterized in that The semi-trapezoidal mold is an arc-shaped mold, and its cross section includes a right-angled trapezoidal section.

5. The tunnel construction joint grooving method according to claim 4, It is characterized in that The semi-trapezoidal mold comprises an upper bottom plate, an inclined waist plate, a lower bottom plate and a longitudinal waist plate connected in sequence, and the cross section of the structure formed by the four is the right-angle trapezoidal cross section; wherein, The lower base plate is located on the upper surface of the second lining trolley top mold, and one end of the lower base plate is connected to the body of the longitudinal waist plate; the longitudinal waist plate is located outside the second lining trolley top mold, and its inner surface is tightly attached to the front end face of the second lining trolley top mold, and its outer surface can fit with the second lining trolley end mold, and the lower end of the longitudinal waist plate is fixed on the second lining trolley body.

6. The tunnel construction joint grooving method according to claim 4, It is characterized in that The trapezoidal groove is an isosceles trapezoidal groove, and the right-angled trapezoidal cross section is half of the cross section of the isosceles trapezoidal groove.

7. The tunnel construction joint grooving method according to claim 3, It is characterized in that The cross section of the molding strip is trapezoidal and consistent with the shape of the target groove.

8. The tunnel construction joint grooving method according to claim 3, It is characterized in that The molding strip comprises a rubber strip.

9. The tunnel construction joint grooving method according to claim 1, It is characterized in that Before pouring the next section of secondary lining concrete, the method further comprises the step of modifying the cross section of the front end of the secondary lining trolley to meet the linear requirements.

10. The tunnel construction joint grooving method according to claim 1, It is characterized in that The secondary lining trolley can transmit the vibration received to the mold and the forming strip, so that the concrete at the construction joint vibrates synchronously.