A needle beam trolley lining construction method for small-section tunnels with small curve radius

Abstract

The present invention discloses a needle-beam trolley lining construction method for a small-section tunnel with a small curve radius. The construction method comprises the following steps: construction of a straight section of the tunnel; construction of a small curve radius section of the tunnel; wherein the construction of the small curve radius section of the tunnel comprises the following steps: demoulding and moving the trolley forward; adjusting the needle beam of the trolley; construction of lining steel bars; asymmetrical expansion of the templates on both sides of the trolley; construction of lining concrete; and repeating the above steps until the construction of the small curve radius section is completed. The needle-beam trolley lining construction method for a small-section tunnel with a small curve radius uses a needle-beam trolley for the construction of the small curve radius section, replacing the bracket mold construction method used in the prior art. It gives full play to the advantages of the needle-beam trolley, achieves good lining integrity without horizontal construction joints, has low construction costs, high construction efficiency, and a short construction period.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction methods, and in particular relates to a needle-beam trolley lining construction method for a small-section tunnel with a small curve radius. Background Art

[0002] Currently, hydraulic tunnels under construction in southwest my country are generally characterized by small cross-sections and narrow curved radii. As a crucial component of tunnel structures, the lining construction process directly impacts the overall quality of the tunnel, and needle-beam trolleys are often used for construction.

[0003] However, the existing needle beam trolley is relatively long overall. When facing a small curve radius section of a small-section tunnel, the length factor often makes it difficult for the needle beam to move forward and the center line is difficult to coincide with the center line of the tunnel. At the very least, the thickness of the inner side lining cannot be guaranteed, and at worst, the entire set of tooling is not applicable.

[0004] Therefore, the existing technology has to adopt the bracket formwork method, which greatly increases the difficulty of construction cost progress and construction quality control. The flexible use of the needle beam trolley in the lining construction of small-section tunnels with small curve radius sections is a technical difficulty that needs to be overcome urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a needle beam trolley lining construction method for a small cross-section tunnel with a small curve radius, so as to solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A needle beam trolley lining construction method for a small-section tunnel with a small curve radius comprises the following steps:

[0008] Construction of straight sections of tunnels;

[0009] Construction of tunnel sections with small curve radius;

[0010] The construction of the small curve radius section of the tunnel includes the following steps:

[0011] The trolley is demoulded and moves forward;

[0012] Trolley needle beam adjustment;

[0013] lining reinforcement construction;

[0014] The templates on both sides of the trolley are unfolded asymmetrically;

[0015] End mold sealing;

[0016] lining concrete construction;

[0017] Repeat the above steps until the small curve radius section is completed.

[0018] In one possible design, the step trolley needle beam adjustment includes the following steps:

[0019] First measurement and setting out;

[0020] Positioning device adjustment;

[0021] Positioning retest;

[0022] Repeat the above steps until the positioning retest is qualified.

[0023] In one possible design, the first step of measuring and setting out includes the following steps:

[0024] Take the midpoint of the tunnel centerline of the next mold lining as the reference point, and make the centerline of the needle beam tangent to the tunnel centerline at this position;

[0025] Determine the coordinates of the midpoints of the two ends of the needle beam;

[0026] Construction site marking.

[0027] In one possible design, the step adjustment device adjustment includes the following steps:

[0028] A positioning device is provided below at least one of the two ends of the needle beam;

[0029] One end of the needle beam is fixed, and the other end of the needle beam is adjusted by a positioning device;

[0030] The two ends of the needle beam are cross-adjusted several times until the needle beam moves to the layout mark position.

[0031] In one possible design, the positioning device includes a support platform, rollers, a horizontal positioning member, and a vertical support member;

[0032] The top surface of the support platform is provided with a positioning groove and a limiting block. There are several rollers that are rotatably arranged in the positioning groove at equal intervals. There are two limiting blocks that are respectively fixed at both ends of the positioning groove. The bottom surface of the support platform is provided with a vertical support member.

[0033] The lateral positioning part includes a lateral jack, an outer support leg and an inner support leg. The lateral jack is parallel to the support platform. The lateral jack has a relative outer end and an inner end. The outer end is connected to the outer support leg, and the inner end is connected to the inner support leg. Accordingly, the outer support leg is vertically arranged and extends above the top surface of the support platform, and the inner support leg is connected to the support platform through a fixing part.

[0034] In a possible design, the fixing member is constructed as an I-shaped plate, which has two opposite connecting surfaces, and each connecting surface is provided with a transverse adjustment member; the support platform includes two oppositely arranged supporting beams, and the gap between the two supporting beams is constructed as the adjustment groove;

[0035] Correspondingly, the roller connects the two joists; a group of vertical support members are connected to the bottom surface of each joist, and the vertical support members include at least two jacking jacks arranged at intervals.

[0036] In one possible design, the step location retest includes the following steps:

[0037] A plumb bob is provided at the midpoint of each end of the needle beam;

[0038] Check whether the plumb line and the stakeout mark positions coincide with each other.

[0039] In one possible design, the asymmetrical expansion of the templates on both sides of the step trolley includes the following steps:

[0040] Second measurement and setting out;

[0041] Template expansion;

[0042] Among them, the trolley includes two templates facing the two side walls of the small curve radius section respectively. The template is divided into several sub-areas. Each sub-area is connected to a supporting cylinder. The supporting cylinder adjusts the distance between the corresponding sub-area and the side wall according to the second measurement and lofting results to make the template fit the designed lining contour line.

[0043] In one possible design, the step template unfolding includes the following steps: applying a release agent; adjusting the corresponding support cylinder stroke; unfolding the template using a small-amplitude, multi-frequency, and multi-cylinder alternating coordination method; re-testing and checking; repeating the above steps until the template fits the designed lining contour line.

[0044] In one possible design, the step of end mold sealing includes the following steps:

[0045] The third measurement and setting out;

[0046] sealing mold;

[0047] wherein, an end mold line is obtained by the third measurement and setting out, and the end mold line is along the radial direction of the small curve radius section (12) of the tunnel and passes through the center of the circle;

[0048] The step of sealing the mold includes the following steps: selecting a first end sealing plate and a second end sealing plate; fixing the first end sealing plate and the second end sealing plate to both ends of the mold plate respectively;

[0049] The first end sealing plate is arranged between the template and the upper mold and overlaps with the upper mold; the second end sealing plate is arranged on the inner side of the end of the template and along the end mold line.

[0050] Beneficial effects:

[0051] The needle-beam trolley lining construction method for small-section tunnels with small curve radius sections uses a needle-beam trolley for the construction of small curve radius sections, replacing the bracket mold construction method used in the prior art. It fully utilizes the advantages of the needle-beam trolley, has good lining integrity and no horizontal construction joints, has low construction costs, high construction efficiency, and a short construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic diagram of the construction process of the small curve radius section of the tunnel.

[0053] Figure 2-7 This is a structural schematic diagram of the various processes of a needle-beam trolley lining construction method for a small-section tunnel with a small curve radius.

[0054] Figure 8 The figure is a structural diagram of a lateral positioning device.

[0055] Figure 9 for Figure 8 Schematic diagram of the side structure.

[0056] Figure 10 The present invention is a structural schematic diagram of a lateral positioning system when two lateral positioning devices are provided.

[0057] Figure 11 The present invention is a structural schematic diagram of a transverse positioning system when a transverse positioning device is provided.

[0058] Figure 12 Schematic diagram of the layout of cross-section measuring points in the second measurement and layout.

[0059] In the picture:

[0060] 1. Support platform; 101. Support beam; 2. Roller; 3. Horizontal adjustment member; 31. Transverse movement jack; 32. Outer support leg; 33. Inner support leg; 4. Vertical support member; 401. Lifting jack; 5. Adjustment slot; 6. Limit block; 7. Fixing member; 8. Needle beam; 9. Distribution beam; 10. Support; 11. Straight section; 12. Small curve radius section; 13. Trolley; 14. Template. DETAILED DESCRIPTION

[0061] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0062] Example 1:

[0063] like Figures 1-12 As shown, a needle beam trolley lining construction method for a small-section tunnel with a small curve radius includes the following steps:

[0064] Construction of the straight section 11 of the tunnel;

[0065] Construction of the tunnel's small curve radius section 12;

[0066] It is easy to understand that the tunnel can be divided into a straight section 11 and a small curve radius section 12. Under different construction conditions, there is at least one straight section 11 and a small curve radius section 12 and they can be combined arbitrarily, that is, there is no specific construction order for the construction steps of the straight section 11 of the tunnel and the construction steps of the small curve radius section 12 of the tunnel.

[0067] Furthermore, the existing needle beam 8 trolley 13 construction method can be used for the construction of the straight section 11 of the step tunnel. Those skilled in the art know how to construct it, so it will not be described in detail here. For the construction of the small curve radius section 12 of the step tunnel, the needle beam trolley lining construction method for the small curve radius section of the small cross-section tunnel uses the needle beam 8 trolley 13 for the construction of the small curve radius section 12, replacing the bracket mold construction method used in the prior art. It fully utilizes the advantages of the needle beam 8 trolley 13, has good lining integrity and no horizontal construction joints, low construction cost, high construction efficiency, and short construction period.

[0068] Specifically, the construction of the tunnel small curve radius section 12 includes the following steps:

[0069] S100: The trolley 13 is demoulded and moved forward.

[0070] The supporting cylinders on trolley 13 are activated, causing the formwork 14 of trolley 13 to retract and disengage from the completed lining structure. This allows trolley 13 to regain its freedom, allowing it to advance and adjust its position. Simultaneously, trolley 13 advances and enters the next construction area. If the next construction area is a straight section 11, the existing needle beam 8 trolley 13 construction method can be used. If the next construction area is a tunnel section with a small curve radius 12, trolley 13 must first be repositioned.

[0071] S200: Trolley 13 needle beam 8 adjustment.

[0072] When the trolley 13 enters the small curve radius section 12, not only is it difficult to move forward, the forward movement distance is limited, and it is difficult to complete the construction of the entire small curve radius section 12. In addition, the center line of the trolley 13 needle beam 8 will gradually deviate from the tunnel center line. After the support cylinder is activated to drive the template 14 to extend, the distance between the templates 14 on both sides of the trolley 13 and the two side walls of the small curve radius section 12 is not uniform, and the lining thickness cannot be guaranteed. Therefore, by adjusting the position of the trolley 13 needle beam 8 in step S200 to adjust the direction of the trolley 13, the trolley 13 has the ability to move laterally and turn, and can well adapt to the linear characteristics of the small radius curve section.

[0073] S300: Lining reinforcement construction.

[0074] Based on this, a lining foundation structure is formed. At the same time, when the trolley 13 and the template 14 are unfolded, the lining steel bars play a limiting role. When the template 14 abuts against the steel bars, it means that the template 14 has moved to the extreme position.

[0075] S400: The templates 14 on both sides of the trolley 13 are unfolded asymmetrically.

[0076] Taking the construction of the straight section 11 as an example, in the existing needle beam 8 trolley 13 construction method, the templates 14 on both sides of the trolley 13 are equidistant from the walls of the straight section 11, and the templates 14 can be deployed using the same parameters. However, in the small curve radius section 12, the templates 14 on both sides of the trolley 13 are unequally spaced from the walls of the small curve radius section 12, and the small curve radius section 12 is curved. Therefore, the templates 14 must be deployed asymmetrically to achieve high alignment accuracy. This can effectively avoid the problem of insufficient lining thickness on the inside of the small curve radius section 12 of small-section tunnels, effectively ensuring the lining thickness quality. The lining structure can then be optimized based on the characteristics of the curve, so that the lining lengths on both sides of the curved section are unequal, effectively ensuring the linear quality of the lining.

[0077] S500: End mold sealing.

[0078] After the template 14 is unfolded, the side wall of the small curve radius section 12 and the template 14 are opposite to each other and form a lining area. The lining area has two opposite ends, one end of which is connected to the upper mold and the other end is open. The two ends of the lining area are closed by the end mold to form a closed lining area, which is convenient for the next step of construction.

[0079] S600: Lining concrete construction.

[0080] Due to the tunnel's small cross-section, concrete transportation must be divided into stages. Large-volume concrete tankers are used for transportation outside the tunnel to the tunnel entrance, while smaller concrete tankers or material transport vehicles with structural dimensions appropriate for the tunnel's cross-section are used inside the tunnel to transport concrete to the pouring site. Before pouring, debris must be cleared from the tunnel, and transportation within the tunnel must be scheduled to ensure a continuous and uninterrupted pouring process. Concrete is poured using a concrete pump. Based on the tunnel's longitudinal slope, concrete is poured symmetrically in layers from bottom to top through pre-reserved pouring openings. The layers are 50 cm thick, and the height difference between the concrete surfaces on both sides is ≤30 cm. A vibration method combining a flat-plate vibrator and a tamping rod inserted through the pre-reserved pouring openings is used to ensure concrete density. The formwork is removed after the concrete has been cured to its design strength.

[0081] S700: Repeat the above steps until the construction of the small curve radius section 12 is completed.

[0082] The small curve radius section 12 is divided into several molds based on the length of the trolley 13 template 14. Each mold is then constructed using the method in steps S100-S500. Based on this, the trolley 13 mobile construction process is optimized to one mold per adjustment, with multiple, small adjustments, making full use of the tunnel clearance for the intended lining section, reducing construction difficulty and facilitating construction.

[0083] In this embodiment, step S200 of adjusting the position of the trolley 13 and the needle beam 8 includes the following steps:

[0084] S210: first measurement and setting out;

[0085] S220: Position adjustment of the position adjustment device;

[0086] S230: Positioning retest;

[0087] S240: Repeat the above steps until the positioning retest is qualified.

[0088] The first measurement and setting out in step S210 includes the following steps:

[0089] S211: The midpoint of the center line of the tunnel of the lower mold lining is used as the reference point, so that the center line of the needle beam 8 is tangent to the center line of the tunnel at this position;

[0090] S212: Determine the coordinate positions of the midpoints of the two ends of the needle beam 8;

[0091] S213: Construction site marking.

[0092] like Figure 5 As shown, let the reference point be point B, and the midpoints of the two ends of the needle beam 8 be points A and C respectively. Calculate the positions of points A and C when the center line of the needle beam 8 is tangent to the center line of the tunnel at this position, and mark them to serve as the adjustment end point and the positioning re-survey reference.

[0093] Step S220: Position adjustment of the position adjustment device includes the following steps:

[0094] S221: A positioning device is provided below at least one of the two ends of the needle beam 8;

[0095] S222: One end of the needle beam 8 is fixed, and the other end of the needle beam 8 is adjusted by the adjustment device;

[0096] S223: The two ends of the needle beam 8 are cross-adjusted multiple times until the needle beam 8 moves to the layout mark position.

[0097] like Figure 5 As shown, based on the spatial relationship, the adjustment range of the front end of the needle beam 8 is relatively small (point C). This position can be adjusted to the predetermined position first, and then the end of the needle beam 8 (point A) can be adjusted. During the process, if multiple adjustments are required due to limited spatial relationships or excessive adjustment range, a method of fixing one end and adjusting the other end and then adjusting the two ends in a cross-step manner is used to perform multiple adjustments until the needle beam 8 is adjusted to the predetermined position.

[0098] Step S230 positioning retest includes the following steps:

[0099] S231: A plumb bob is provided at the midpoints of both ends of the needle beam 8;

[0100] S232: Check whether the plumb line and the layout mark position coincide with each other.

[0101] Alternatively, a plumb line may be placed in advance, and the lateral movement of the trolley 13 may be adjusted based on the positional relationship between the plumb line and the layout mark to improve the efficiency of the adjustment.

[0102] In this embodiment, step S400 of asymmetrically unfolding the templates 14 on both sides of the trolley 13 includes the following steps:

[0103] S401: Second measurement and layout.

[0104] In the second measurement and setting out, according to the curve characteristics of the small radius curve section, when the template 14 is aligned, the relative thickness of the inner midpoint position and the outer two ends of the curve is relatively small and it is easy to be underthick. When measuring and setting out, focus on control and set a measurement section at each end and the middle of the lining, such as Figure 12 As shown, 8 measuring points are arranged on each section. At the same time, during tunnel excavation, appropriate over-excavation is performed on the small radius curve section to reserve adjustment space for the lining template 14, so as to simultaneously meet the tunnel clearance and lining thickness requirements.

[0105] S402: The template 14 is expanded.

[0106] When the template 14 is unfolded, the template 14 is coated with a mold release agent. According to the measurement results of the second measurement and lofting, the corresponding support cylinder stroke is adjusted in different areas to make the template 14 fit the designed lining contour line. This process should be carried out with small amplitude, multiple frequencies, and multiple cylinders alternating and coordinated adjustments to prevent jamming or deformation of the template 14 due to excessive adjustment of the stroke of individual cylinders.

[0107] After unfolding, use a tape measure to re-check the gap between the outer edge of the formwork 14 and the primary support (lining thickness) and the thickness of the steel bar protective layer at each part, focusing on re-measuring the inner middle and outer end positions of the curve. When inspecting the middle position, insert the tape measure through the reserved casting port for inspection. If the size is found to be insufficient, make timely adjustments.

[0108] Based on this, the template 14 is positioned more accurately through asymmetric expansion, which can effectively avoid the problem of insufficient lining thickness on the inner side of the small curve radius section 12 of the small-section tunnel and effectively ensure the quality of the lining thickness.

[0109] The measurement and layout and the lateral expansion adjustment of the template 14 must be carried out simultaneously, and the measurement and adjustment should be carried out simultaneously until the tunnel clearance and lining thickness requirements are met.

[0110] Among them, the trolley 13 includes two templates 14 facing the two side walls of the small curve radius section 12 respectively. The template 14 is divided into several sub-areas. Each sub-area is connected to a supporting cylinder. The supporting cylinder adjusts the distance between the corresponding sub-area and the side wall according to the second measurement and layout result to make the template 14 fit the designed lining contour line.

[0111] Based on this, the step of unfolding the template 14 includes the following steps: applying a release agent; adjusting the corresponding supporting cylinder stroke; unfolding the template 14 in a small-amplitude, multi-frequency, and multi-cylinder alternating and coordinated manner; re-testing and checking; repeating the above steps until the template 14 fits the designed lining contour line.

[0112] In this embodiment, step S500 of end mold sealing includes the following steps:

[0113] S501: The third measurement and setting out.

[0114] The third measurement and setting out process obtains the end form line, which runs along the radial direction of the tunnel's small curved radius section 12 and passes through the center. Furthermore, any suitable existing measurement method can be used for the third measurement and setting out process. For the lining area, one end is connected to the upper formwork, while the other end is open. The end form line limits the position of the open end formwork to improve lining quality.

[0115] S502: Mold sealing. The mold sealing step S502 includes the following steps: selecting a first end sealing plate and a second end sealing plate; and fixing the first end sealing plate and the second end sealing plate to the two ends of the template 14 respectively.

[0116] The first end sealing plate is arranged between the template 14 and the upper mold and overlaps with the upper mold; the second end sealing plate is arranged on the inner side of the end of the template 14 and along the end mold line.

[0117] Based on this, the lining area is optimized according to the curve characteristics of the small curve radius section 12 of the tunnel, so that the lengths of the lining areas on both sides of the small curve radius section 12 are not equal, effectively ensuring the linear quality of the lining.

[0118] Example 2:

[0119] This embodiment introduces a positioning device used in embodiment 1 based on embodiment 1, wherein Figures 8-11 As shown, the positioning device includes a support platform 1, a roller 2, a horizontal positioning member 3 and a vertical support member 4;

[0120] The top surface of the support platform 1 is provided with a positioning groove 5 and a limit block 6. A plurality of rollers 2 are provided and are rotatably arranged in the positioning groove 5 at equal intervals. Two limit blocks 6 are provided and are fixed at both ends of the positioning groove 5. The bottom surface of the support platform 1 is provided with a vertical support member 4.

[0121] The lateral positioning component 3 includes a lateral movement jack 31, an outer support leg 32 and an inner support leg 33. The lateral movement jack 31 is parallel to the support platform 1. The lateral movement jack 31 has a relative outer end and an inner end. The outer end is connected to the outer support leg 32, and the inner end is connected to the inner support leg 33. Accordingly, the outer support leg 32 is vertically arranged and extends above the top surface of the support platform 1, and the inner support leg 33 is connected to the support platform 1 through a fixing member 7.

[0122] When the needle beam 8 needs to be adjusted, the adjusting device is moved to the bottom of the needle beam 8, the support platform 1 is connected to the bottom surface of the needle beam 8, and the horizontal adjusting member 3 is used to provide a driving force to push and pull the needle beam 8 along the adjusting groove 5 to adjust the position of the needle beam 8, reduce the difficulty of moving the needle beam 8 in the tunnel, and make the center line of the needle beam 8 coincide with the center line of the tunnel, which is convenient for construction.

[0123] The support structure formed by the support platform 1 allows the needle beam 8 to be inserted into the adjustment slot 5 and abut against the roller 2. The roller 2 can rotate, effectively reducing the difficulty of moving the needle beam 8. The transverse adjustment member 3 is connected to the needle beam 8 through its connecting end, providing a driving force to push and pull the needle beam 8, allowing it to slide along the adjustment slot 5. The limit block 6 is used to limit the range of movement of the needle beam 8, ensuring that the needle beam 8 does not leave the support platform 1.

[0124] At the same time, considering that supports 10 are provided at both ends of the needle beam 8 and the supports 10 are pressed on the tunnel, a vertical support member 4 is provided. The needle beam 8 is lifted by the vertical support member 4 to raise the end of the needle beam 8 and the support 10 is separated from the tunnel, which effectively reduces the difficulty of the horizontal adjustment member 3 in pushing the needle beam 8.

[0125] The lateral movement jack 31 can be any suitable commercially available jack and can be positioned horizontally to achieve lateral movement. The outer support leg 32 is used to connect to the needle beam 8, and preferably, the outer support leg 32 is detachably connected to the needle beam 8 to facilitate timely assembly and disassembly. The inner support leg 33 is used to connect to the fixing member 7 to secure the lateral adjustment member 3 to the support platform 1 and provide a fulcrum for applying force. It will be readily understood that the outer support leg 32 and the inner support leg 33 can be constructed in any suitable shape, and the outer support leg 32 can be connected to the needle beam 8 via any suitable detachable connection method.

[0126] During operation, the positioning device is located below needle beam 8. The lower portion of needle beam 8 is inserted into positioning slot 5 and abuts roller 2. The connecting end of transverse positioning member 3 is connected to needle beam 8. Vertical support member 4 is activated to lift needle beam 8, which lifts needle beam 8 and releases its support 10 from the tunnel. Once released, support 10 locks into place with vertical support member 4. Lateral positioning member 3 is activated, powered by transverse jack 31, pushing and pulling needle beam 8 along positioning slot 5 via external support legs 32 until needle beam 8 reaches the desired position.

[0127] like Figure 8 As shown, the fixing member 7 is constructed as an I-shaped plate with two opposing connecting surfaces, each of which is equipped with a transverse adjustment member 3. Based on this design, the two needle beams 8 work intermittently and push and pull the needle beams 8 in opposite directions, thereby increasing the range of movement and adjustment of the needle beams 8. Furthermore, the two needle beams 8 can work together and push and pull the needle beams 8 in the same direction, thereby increasing the weight range that can be pulled by the needle beams 8 and expanding the scope of use.

[0128] In one possible implementation, the platform 1 includes two opposing joists 101. The gap between the two joists 101 serves as the adjustment slot 5. Accordingly, the rollers 2 connect the two joists 101. Based on the above design, the joists 101 are existing standard components with a wide variety of models and options, which helps reduce operating costs. Furthermore, the two joists 101, when used in conjunction with each other, also help reduce the weight of the platform 1.

[0129] In one possible implementation, a set of vertical supports 4 is connected to the bottom surface of each joist 101. These supports 4 include at least two spaced-apart lifting jacks 401. Based on the aforementioned design, multiple vertical supports 4 are provided to distribute the weight of the needle beam 8 and protect the positioning device. Furthermore, the interaction of these multiple vertical supports 4 enhances lifting capacity. Furthermore, any suitable commercially available model can be used for the lifting jacks 401.

[0130] Example 3:

[0131] Based on Examples 1 and 2, this embodiment uses actual construction as an example to compare and analyze the benefits of the needle beam trolley lining construction method for small-section tunnels with small curve radius sections with the bracket molding method used in the prior art:

[0132] Taking the Huangniya water diversion tunnel of the Randutan Reservoir Project in Zunyi City as an example, see Tables 1 and 2 for details (tunnel diameter 2.4m, tunnel length 1800m, including a small radius curve section of 300m).

[0133] 1. Cost comparison

[0134] Table 1 Analysis of the differences in construction quantities and components of different construction methods in the small radius curve section of the Huangniya water diversion tunnel

[0135]

[0136] Construction cost calculation:

[0137] (1) Bracket molding method

[0138] Bracket rental fee: 1.51 × 8 × 88 = 1063.04 yuan

[0139] Longitudinal main beam material and processing fee: (0.34×4200+350×1)×300÷9÷10=5954.67 yuan

[0140] Ring beam material and processing fee: 0.85 × (6283.15 + 822.83 + 289.58) = 6286.23 yuan

[0141] Formwork material cost: 65×50=3250 yuan

[0142] Installation and removal fee of support template: 400×6×300÷9=80000

[0143] Template trolley replacement and disassembly fee: 10,000+3,000+1,500=14,500 yuan;

[0144] (2) Needle beam trolley positioning method

[0145] Material, processing, and installation costs for the positioning device: ((3,000 + 400 × 4) + 100 × 300 ÷ 9) × 2 = 7,933.33 yuan;

[0146] In summary, the cost savings are: (1063.04+5954.67+6286.23+3250+80000+14500-7933.33=103120.61 yuan.

[0147] 2. Comparison of construction period

[0148] According to on-site construction statistics, the scaffolding formwork method can complete one construction cycle every 2.5 days, and the needle beam trolley positioning method can complete one construction cycle every day. The construction period comparison is as follows:

[0149] Table 2 Construction period difference analysis table

[0150]

[0151] Looking at the entire project, the two channels saved a total of 103,120.61 yuan, the construction period was shortened by 55 days, the lining construction quality was good, and the social and economic benefits were significant.

[0152] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A needle beam trolley lining construction method for small cross-section tunnels with small curve radius, characterized in that: The following steps are involved: Construction of the straight section of the tunnel (11); Construction of small curve radius section (12) of tunnel; The construction of the tunnel small curve radius section (12) includes the following steps: The trolley (13) is demoulded and moved forward; The trolley (13) and the needle beam (8) are adjusted; lining reinforcement construction; The templates (14) on both sides of the trolley (13) are unfolded asymmetrically; End mold sealing; lining concrete construction; Repeat the above steps until the small curve radius section (12) is completed; The step of adjusting the position of the trolley (13) and the needle beam (8) includes the following steps: First measurement and setting out; Positioning device adjustment; Positioning retest; Repeat the above steps until the positioning retest is qualified; Steps The positioning device positioning includes the following steps: A positioning device is provided below at least one of the two ends of the needle beam (8); One end of the needle beam (8) is fixed, and the other end of the needle beam (8) is adjusted by a positioning device; The two ends of the needle beam (8) are cross-adjusted multiple times until the needle beam (8) moves to the layout mark position; The positioning device comprises a support platform (1), a roller (2), a horizontal positioning member (3) and a vertical support member (4); A positioning groove (5) and a limiting block (6) are provided on the top surface of the support platform (1); a plurality of rollers (2) are provided and are rotatably arranged at equal intervals in the positioning groove (5); two limiting blocks (6) are provided and are respectively fixed at both ends of the positioning groove (5); a vertical support member (4) is provided on the bottom surface of the support platform (1); The transverse positioning member (3) includes a transverse jack (31), an outer support leg (32) and an inner support leg (33), wherein the transverse jack (31) is parallel to the support platform (1), and the transverse jack (31) has an outer end and an inner end opposite to each other, wherein the outer end is connected to the outer support leg (32) and the inner end is connected to the inner support leg (33); accordingly, the outer support leg (32) is vertically arranged and extends above the top surface of the support platform (1), and the inner support leg (33) is connected to the support platform (1) through a fixing member (7).

2. The construction method according to claim 1, characterized in that: Step 1: Measurement and setting out includes the following steps: Taking the midpoint of the tunnel centerline of the next mold lining as the reference point, the centerline of the needle beam (8) is made tangent to the tunnel centerline at this position; Determine the coordinate positions of the midpoints of the two ends of the needle beam (8); Construction site marking.

3. The construction method according to claim 1, characterized in that: The fixing member (7) is constructed as an I-shaped plate, which has two opposite connecting surfaces, and each of the two connecting surfaces is provided with a transverse positioning member (3); the support platform (1) includes two oppositely arranged supporting beams (101), and the gap between the two supporting beams (101) is constructed as the positioning groove (5); Accordingly, the roller (2) connects the two supporting beams (101), and a group of vertical support members (4) are connected to the bottom surface of each supporting beam (101), and the vertical support members (4) include at least two lifting jacks (401) arranged at intervals.

4. The construction method according to claim 1, characterized in that: Step Positioning retest includes the following steps: A plumb bob is provided at the midpoint of each end of the needle beam (8); Check whether the plumb line and the stakeout mark positions coincide with each other.

5. The construction method according to claim 1, characterized in that: The step of asymmetrically unfolding the templates (14) on both sides of the trolley (13) includes the following steps: Second measurement and setting out; Template (14) expanded; The trolley (13) includes two templates (14) facing the two side walls of the small curve radius section (12), respectively. The template (14) is divided into a plurality of sub-areas. Each sub-area is connected to a supporting oil cylinder. The supporting oil cylinder adjusts the distance between the corresponding sub-area and the side wall according to the second measurement and lofting result, so that the template (14) fits the designed lining contour line.

6. The construction method according to claim 5, characterized in that: The step template (14) is expanded to include the following steps: Apply release agent; adjust the corresponding support cylinder stroke; unfold the template (14) in a coordinated manner using multiple cylinders with small amplitudes and multiple frequencies; re-measure and check; repeat the above steps until the template (14) fits the designed lining contour line.

7. The construction method according to claim 1, characterized in that: The end mold sealing step includes the following steps: The third measurement and setting out; sealing mold; wherein, an end mold line is obtained by the third measurement and setting out, and the end mold line is along the radial direction of the small curve radius section (12) of the tunnel and passes through the center of the circle; The mold sealing step includes the following steps: selecting a first end sealing plate and a second end sealing plate; fixing the first end sealing plate and the second end sealing plate to both ends of the template (14) respectively; The first end sealing plate is arranged between the template (14) and the upper mold and overlaps the upper mold; the second end sealing plate is arranged on the inner side of the end of the template (14) and is arranged along the end mold line.

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