A construction method for tunneling blind pipe grooving

Abstract

The application discloses a tunnel blind pipe groove carving construction method, comprising measurement lofting, shotcrete, laser positioning, excavator single-hook line carving, artificial groove forming, blind pipe trial installation and blind pipe installation. The application adopts the annular drainage blind pipe groove carving construction process, and the construction method is simple in operation, good in groove forming, short in process time, fast in construction progress, high in arch wall lining compactness and low in formation of the cavity behind the lining.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a tunnel blind pipe slotting construction method. BACKGROUND

[0002] When laying a waterproof layer at the circumferential blind pipe, a cavity is prone to occur, and meanwhile, since the blind pipe is attached to the primary support surface, a cavity behind the secondary lining and insufficient thickness of the secondary lining and other entity quality problems are prone to occur, which affect the engineering quality. In order to avoid this problem, the circumferential blind pipe is entirely slotting constructed. The primary support surface slotting construction is first used at the entrance of Hongyuan No. 1 tunnel, and during the construction, multiple attempts are made. The PVC pipe is once attempted to be embedded, and since the embedded pipe is combined with the concrete, when the embedded pipe is removed, the concrete around the pipe is affected by the removal of the pipe, and the corners of the concrete are missing, the blind pipe slotting effect is too poor, and the primary support surface is damaged. After the embedded pipe is installed, the problems such as the non-dense sprayed concrete behind the pipe are prone to occur. The steel frame is separately processed and shaped, and the arch frame is enlarged by 5 cm at the embedded pipe position. Since the arch frame is enlarged by 5 cm, the benching is prone to occur, and the construction quality of the subsequent arch frame installation, mesh lapping, connecting rib welding and other processes is also difficult to guarantee, and finally the problems such as the benching of the primary support surface, local bulging and poor flatness of the primary support are prone to occur, which are not very ideal. SUMMARY

[0003] The purpose of the present application is to solve the problem of blind pipe slotting difficulty in the prior art, and a tunnel blind pipe slotting construction method is provided.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] A tunnel blind pipe slotting construction method comprises the following steps:

[0006] Step 1: measurement and setting out;

[0007] Step 1.1: arch frame installation;

[0008] Step 1.2: the measurement personnel use a total station to set out and position on site according to the blind pipe design mileage position;

[0009] Step 1.3: avoid the steel arch frame, and use embedded steel bars to position the blind pipe slotting position, one steel bar is embedded every 2 m in the circumferential direction to ensure the circumferential perpendicularity during slotting, and the sprayed concrete thickness can also be checked;

[0010] Step 2: sprayed concrete;

[0011] The mechanical hand is used to spray C25 concrete, and the sprayed concrete is layered from bottom to top. During the construction, attention should be paid to not knock off or spray the reserved steel bars on the steel frame. The last layer of sprayed concrete is constructed, and the slotting worker is notified by the duty officer to enter the site in advance to prepare.

[0012] Step 3: Laser positioning;

[0013] Step 3.1: 10 minutes after the completion of the last layer of sprayed concrete, mark the position of the embedded steel bar with a ring laser lamp according to the position of the embedded steel bar;

[0014] Step 3.2: Adjust the level to the position of the embedded steel bar, and observe whether the position is offset to ensure that the blind pipe position is symmetrical left and right;

[0015] Step 4: Excavator single hook line marking;

[0016] According to the position of the laser positioning, the single hook of the excavator is used for preliminary line marking, and the construction time is 6-8 minutes;

[0017] Step 5: Artificial groove forming;

[0018] According to the initial setting time of the sprayed concrete, the construction is carried out immediately after the completion of the sprayed concrete. After the excavation rack is positioned, the worker uses a slotting machine and other tools on the excavation rack to accurately groove. First, the slotting machine is used to mark the line along the laser positioning line, and the concrete in the groove is chiseled from bottom to top with a pickaxe;

[0019] Step 6: Blind pipe trial assembly;

[0020] After the grooving is completed, 50 blind pipes are trial assembled, and the positions that cannot be embedded locally are grooved again to avoid the width and depth of the groove being different after the subsequent blind pipe installation, and the blind pipe cannot be installed, causing a hollow behind the waterproof plate;

[0021] Step 7: Blind pipe installation;

[0022] After the groove is formed, the blind pipe is bundled with a wire, and a nail gun is used to shoot nails on the fixed belt to fix it on the initial support surface.

[0023] Preferably, in step 4, the lower and middle steps are first grooved, and the upper step is sprayed after the grooving.

[0024] Preferably, in step 5, the groove depth is 7 cm, the width is 7 cm, the construction time is 10-15 minutes, and the groove line type is straight and the slot position is neat.

[0025] Preferably, in step 5, a 7cm deep position is marked on the iron pickaxe with red paint before construction, and the mark is re-marked in time when it is not clear, and a 7cm wide position is marked with a steel bar at the 7cm position to ensure the quality of the grooving construction.

[0026] Preferably, in step 7, a 3cm x 15cm long waterproof plate narrow strip fixed belt is used to fix the φ50 water permeable blind pipe in the groove.

[0027] Preferably, in step 7, the arched wall lining waterproof plate is provided with a 50mm inner diameter DG blind pipe in a ring direction behind the arched wall lining waterproof plate, and the ring direction blind pipe is arranged at a spacing of 9m in a general section and arranged at a spacing of 4m in a water-rich section.

[0028] The application further provides a tunnel blind pipe grooving method, which comprises the following steps:

[0029] Compared with the prior art, the application provides a tunnel blind pipe grooving method, which has the following beneficial effects:

[0030] 1. The tunnel blind pipe grooving method has the advantages that the ring direction drainage blind pipe grooving construction process is adopted, the operation of the construction method is simple, the grooves are well formed, the process time is shortened, the construction progress is accelerated, the arched wall lining compactness is improved, and the formation of the cavity behind the lining is reduced.

[0031] 2. The tunnel blind pipe grooving method has the advantages that the ring direction drainage blind pipe grooving construction process is adopted, the concrete waste is reduced, and the process does not need to additionally increase labor and equipment, thereby saving the cost.

[0032] The parts not involved in the device are the same as or can be realized by the prior art, the application has the advantages of simple structure and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The application is illustrated by the flowchart. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be clearly and completely described with reference to the drawings in the embodiments of the application, and the drawings are as follows: Figure 1 A tunnel blind pipe grooving method comprises the following steps:

[0035] Step 1: measurement and setting out;

[0036] Step 1.1: installation of an arched frame;

[0037] Step 1.2: a measurement personnel uses a total station instrument to perform on-site setting out positioning according to the blind pipe design mileage position;

[0038] Step 1.3: a steel reinforcement is used to position the blind pipe grooving position by avoiding the steel arched frame, one steel reinforcement is embedded in a ring direction every 2m, the ring direction perpendicularity is ensured when grooving, and the thickness of the sprayed concrete can be checked;

[0039] Step 2: spraying of concrete;

[0040] Mechanical hand spray C25 concrete, from bottom to top, spray concrete, construction should not be reserved on the steel frame steel bar off or spray to death, spray concrete last layer construction when the operator notice the notch on site in advance preparation. Subsequent construction can be a good guarantee the timing of the notch.

[0041] Step 3: laser positioning;

[0042] Step 3.1: 10 minutes after the last layer of sprayed concrete, according to the position of embedded steel, using ring laser light accurate marking;

[0043] Step 3.2: adjust the level of embedded steel position, to observe whether there is a shift, to ensure that the blind tube position left-right symmetry;

[0044] Step 4: excavator single hook line;

[0045] According to the position of laser positioning, using excavator single hook for preliminary line marking construction time is 6-8 minutes;

[0046] Step 5: manual slot forming;

[0047] According to the initial setting time of sprayed concrete, immediately after the completion of the sprayed concrete construction, first excavate the pedestal, workers on the excavated pedestal with tools such as slotting machine for accurate slotting, first use slotting machine along the laser positioning line for line marking, the slot concrete using pick head from bottom to top for chiseling;

[0048] Step 6: blind pipe test installation;

[0049] After slotting, 50 blind pipe test installation, local embedded position again for slotting, to avoid subsequent blind pipe installation, groove width, depth size, blind pipe can not be installed, resulting in waterproof plate behind the hole;

[0050] Step 7: blind pipe installation;

[0051] After the groove forming, blind pipe using wire bundle, at the same time with the nail gun on the fixed band on the initial support surface.

[0052] In step 1, the advance measurement lofting blind pipe positioning rib mark, effectively shorten the process time, so that the sprayed concrete after the completion of the rapid positioning of the blind pipe position for construction.

[0053] In the step 2, the grooving of the lower and middle steps is firstly carried out, and the arch is sprayed after the upper step is sprayed, so that the forming process is connected, the concrete is sprayed from the lower, middle and upper steps in sequence, and finally the arch is sprayed, so that the grooving of the lower and middle steps can be carried out firstly, the arch is sprayed when the grooving of the upper step is carried out, the construction progress of the concrete spraying is not affected, and the work efficiency is improved and the cost is reduced.

[0054] In the step 3, the laser positioning is fast and accurate, the grooving is carried out along the laser line, and the straightness of the grooving is ensured.

[0055] In the step 4, the single-hook grooving of the excavator is more fast, the use of manual is reduced, the operation platform (excavation rack) is not needed, the operation is simple, and the preliminary grooving can be formed at one time.

[0056] In the step 5, the grooving depth is 7 cm, the width is 7 cm, the construction time is 10-15 minutes, the groove line is straight, and the groove position is neat; the 7 cm deep position is marked on the iron pick by using red paint before construction, the mark is re-marked in time when the mark is not clear, the 7 cm wide position is marked by using steel bars at the 7 cm position, the quality of the grooving construction is ensured, the problem that the local blind pipe cannot be embedded during the installation of the blind pipe is avoided, and the forming effect is good.

[0057] In the step 6, the local non-standard position of the grooving can be found out after the blind pipe is tested and installed, and the local non-standard position is repaired in time, so that the problem that the local blind pipe cannot be embedded during the installation of the blind pipe is avoided.

[0058] In the step 7, the φ50 water permeable blind pipe is fixed in the groove by using the 3 cm*15 cm long waterproof plate narrow strip fixing belt, the 50 mm inner diameter DG blind pipe is arranged in the ring direction behind the lining waterproof plate of the arch wall, and the ring direction blind pipe is arranged at a spacing of 9 m in a general section and at a spacing of 4 m in a water-rich section.

[0059] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A construction method for tunneling and blind pipe grooving, characterized in that, It comprises the following steps: Step 1: measuring lofting; Step 1.1: installation of arch frame; Step 1.2: the measuring personnel uses a total station to position the site lofting according to the mileage position in the blind pipe design; Step 1.3: avoid the steel arch frame, and use embedded steel bars to position the blind pipe groove position, embed a steel bar every 2m in the ring direction to ensure the verticality of the ring direction when grooving, and also check the thickness of the shotcrete; Step 2: shotcrete; Use a mechanical hand to spray C25 concrete, and spray the concrete layer by layer from bottom to top. When constructing, pay attention to not knock off or spray the reserved steel bars on the steel frame. When spraying the last layer of concrete, the on-duty personnel notifies the grooving workers to enter the site in advance for preparation; Step 3: laser positioning; Step 3.1: 10 minutes after the completion of the last layer of shotcrete, accurately mark the position of the embedded steel bar using a ring laser lamp according to the position of the embedded steel bar; Step 3.2: adjust the level to the embedded steel bar position, and observe whether the position is offset to ensure that the blind pipe position is symmetrical left and right; Step 4: single hook groove marking of excavator; According to the position of the laser positioning, use the single hook of the excavator to conduct preliminary groove marking, and the construction time is 6-8 minutes; Step 5: manual groove forming; According to the initial setting time of the shotcrete, immediately conduct construction after the completion of the shotcrete. After excavating the pedestal, workers use a grooving machine to accurately groove on the pedestal. First, use the grooving machine to groove along the laser positioning line. The concrete in the groove is chiseled from bottom to top using a pickaxe head; Step 6: blind pipe trial installation; After grooving, conduct trial installation of the blind pipe. If the blind pipe cannot be embedded in the local position, groove again to avoid the subsequent installation of the blind pipe, which causes the groove width and depth to be different, and the blind pipe cannot be installed, resulting in a hollow behind the waterproof plate; Step 7: installation of blind pipe; After the groove is formed, the blind pipe is bundled with a wire, and a nail gun is used to fix the blind pipe on the initial support surface; In step 5, the groove depth is 7cm, the width is 7cm, the construction time is 10-15 minutes, and the groove line type is straight and the groove position is neat; In step 7, a 3cm×15cm long waterproof plate narrow strip fixing belt is used to fix the permeable blind pipe in the groove; In step 7, a 50mm inner diameter DG blind pipe is arranged in the ring direction behind the arch wall lining waterproof plate, and the ring direction blind pipe is arranged at an interval of 9m in general areas and an interval of 4m in water-rich areas.

2. The method according to claim 1, wherein, In step 5, a 7cm deep position is marked on the pickaxe head using red paint before construction. If the mark is not clear, it is re-marked in time. A 7cm wide position is marked at the 7cm position using a steel bar to ensure the quality of the groove construction.

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