Composite material-muck combined vertical shaft supporting segment structure

Abstract

The utility model discloses a composite material-muck combined vertical shaft support duct piece structure which comprises a plurality of vertical shaft duct piece rings, each vertical shaft duct piece ring is formed by annularly splicing a plurality of duct pieces, the adjacent vertical shaft duct piece rings are spliced in a staggered joint mode, and each duct piece is composed of an arc box and modified muck filled in the arc box. Wedge holes used for installing wedges are formed in the upper end and the lower end of the pipe piece, the number and the positions of the wedge holes in the upper end of the pipe piece correspond to the number and the positions of the wedge holes in the lower end of the pipe piece, and the adjacent shaft pipe piece rings are fixed by installing the wedges in the wedge holes. The utility model has the advantages that the splicing of the tenon-and-mortise structure avoids the use of a bent bolt, so that the splicing of the duct piece is simpler and firmer; and the wedges are mounted in the wedge holes, so that the adjacent shaft segment rings are fixed, and the overall quality of the shaft support segment structure is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shaft segment, especially a composite material - slag combined shaft support segment structure. BACKGROUND

[0002] In the construction of the shaft, the support system after excavation is usually a concrete prefabricated support segment. The segment is made by factory through the processes of binding reinforcement, supporting formwork, pouring concrete, etc. and then transported to the construction site. Because the reinforced concrete has high density, the quality of the made segment is very large, reaching several tons, which cannot be carried and installed by manual or light machinery, and large hoisting equipment and mechanical arms are often used to cooperate with the construction. On the one hand, the use of large equipment will generate large equipment cost, and on the other hand, the alignment and splicing in the construction process need to be realized by remote control, which will also cost a lot of time. At the same time, the bent bolts are usually used to connect the segments in staggered joints, and the bolt is very difficult to be inserted through the two connected segments as long as there is a little deviation. However, there will be certain errors in the prefabricated segment, bolt and installation process, and these errors will accumulate, often resulting in the situation that the bolt cannot be installed. If the bolt is forced to penetrate the two connected segments, there is a high risk of segment rupture.

[0003] In addition, in the process of shaft foundation pit excavation, especially in the vertical excavation by the slurry balance shaft tunneling method, a large amount of waste slurry will be generated, which needs to be pretreated before being transported and dumped outside, otherwise the environment will be polluted.

[0004] Therefore, a composite material - slag combined shaft support segment structure is needed to solve the above problems. SUMMARY

[0005] The utility model discloses a kind of composite material-sludge combined shaft support segment structures to solve the above problems, the shaft support segment structure includes several shaft segment rings, shaft segment ring is assembled by several segments, segment is composed of circular arc box and modified slag filled in circular arc box, wedge hole is set in the upper and lower end of segment, by installing wedge in wedge hole, the fixation between adjacent shaft segment rings is realized, so as to effectively improve the quality of shaft support segment structure whole.

[0006] The utility model discloses a kind of composite material-sludge combined shaft support segment structures to solve the above problems, the shaft support segment structure includes several shaft segment rings, shaft segment ring is assembled by several segments, segment is composed of circular arc box and modified slag filled in circular arc box, wedge hole is set in the upper and lower end of segment, by installing wedge in wedge hole, the fixation between adjacent shaft segment rings is realized, so as to effectively improve the quality of shaft support segment structure whole.

[0007] A composite material-slag combined shaft supporting segment structure, the shaft supporting segment structure comprises a plurality of shaft segment rings, the shaft segment rings are assembled by a plurality of segment rings, adjacent shaft segment rings are staggered assembled, the segment is composed of a circular arc box and modified slag filled in the circular arc box, wedge holes for installing wedges are arranged on the upper and lower ends of the segment, the number and position of the wedge holes on the upper end of the segment correspond to the number and position of the wedge holes on the lower end of the segment, and the adjacent shaft segment rings are fixed by installing the wedges in the wedge holes.

[0008] The segment is provided with a tenon structure and a mortise structure at the two ends respectively, and the adjacent segments in the ring direction are connected through the cooperation of the tenon structure and the mortise structure, and a sealing strip is arranged at the connection of the adjacent segments in the ring direction.

[0009] The convex part of the tenon structure and the two sides of the convex part are provided with the sealing strip, the groove part of the mortise structure and the two sides of the groove part are provided with the sealing strip, and the number and position of the sealing strips on the tenon structure correspond to the number and position of the sealing strips on the mortise structure.

[0010] The circular arc box is composed of a box body with an open top and a cover plate for closing the top of the box body, and the inner walls of the two circular arc vertical plates of the box body are provided with stiffening ribs.

[0011] The shaft segment rings, the box body and the cover plate and the tenon structure and the mortise structure are connected through epoxy glue.

[0012] The shaft supporting segment structure is installed in a foundation pit, and wall-back cement mortar is poured between the shaft supporting segment structure and the surrounding rock of the foundation pit.

[0013] Bottom sealing concrete is poured at the bottom of the shaft supporting segment structure.

[0014] The advantages of the utility model are:

[0015] (1) the fiber reinforced composite material (FRP) is used as the material of the supporting structure, the segment is directly formed through the mould pressing method, the segment has the advantages of simple production, the complex process of the traditional reinforced concrete, that is, binding the reinforcing cage and then pouring the concrete, is reduced, the material is light, the segment structure is in a hollow form, and the segment can be transported and constructed by using light instruments or manually, the transportation efficiency and construction speed are improved, the advantages of low carbon, high efficiency, reducing labor intensity, saving manpower and equipment cost are achieved, and in the assembling process, the spliced mortise and tenon structure avoids the use of bending bolts, so that the segment assembling is simpler and more firm.

[0016] (2) The treatment of the slurry and the muck generated by the shaft excavation has been a problem that must be considered in the shaft construction, and the generated muck and slurry, whether landfill or transportation and disposal, can cause road pollution and water pollution, therefore, the reuse of the shaft excavation slurry and muck has certain economic and environmental benefits; the shaft excavation slurry is pre-screened and formed into coarse aggregate, sandy particles and clay particles by the cyclone mode, the coarse aggregate can be used in the concrete for the shaft bottom sealing, the sandy particles can be used for mixing cement mortar for the wall back grouting, the modified sandy particles are used for the internal filling of the pipe piece, and the modified clay particles can be used as the drag-reducing slurry in the shaft sinking process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall assembly schematic view of the shaft pipe piece ring of the utility model;

[0018] Figure 2 It is the staggered joint assembly schematic view of the pipe piece of the utility model;

[0019] Figure 3 It is the perspective view (one) of the pipe piece of the utility model;

[0020] Figure 4 It is the perspective view (two) of the pipe piece of the utility model;

[0021] Figure 5 It is the connection schematic view between the pipe pieces of the utility model;

[0022] Figure 6 It is the internal schematic view of the box of the utility model;

[0023] Figure 7 It is the schematic view of the cover plate of the utility model;

[0024] Figure 8 It is the installation schematic view of the wall back grouting pipeline of the utility model;

[0025] Figure 9 It is the partial enlarged view of Figure 8 ;

[0026] Figure 10 It is the working schematic view of the grouting pipeline of the utility model;

[0027] As shown in Figures 1-10 , the marks in the figure respectively represent:

[0028] Pipe piece 1, joint seam 2, wedge hole 3, tenon structure 4, mortise structure 5, sealing strip 6, circular arc box 7, box 8, cover plate 9, circular arc vertical plate 10, stiffening rib 11, surrounding rock 12, wall back grouting pipeline 13. DETAILED DESCRIPTION

[0029] The features and other related features of the present application are further described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of the skilled in the art:

[0030] Embodiment: as Figures 1-10 shown, the present embodiment relates to a composite material-slag combined shaft support segment structure, the shaft support segment structure comprises a plurality of shaft segment rings, the shaft segment rings are connected by epoxy adhesive, the shaft segment ring is assembled by a plurality of segments 1, the adjacent segments 1 form a joint seam 2, the adjacent shaft segment rings are staggered, in the embodiment, m shaft segment rings are arranged from bottom to top, the joint seam 2 of the nth shaft segment ring and the joint seam 2 of the n+1th shaft segment ring are not in the same vertical position, the joint seam 2 of the nth shaft segment ring and the joint seam 2 of the n+2th shaft segment ring are in the same vertical position. The upper and lower ends (the top of the cover plate 9 and the bottom of the box body 8) of the segment 1 are provided with wedge holes 3 for installing wedges, the number and position of the wedge holes 3 at the upper end (the top of the cover plate 9) of the segment 1 correspond to the number and position of the wedge holes 3 at the lower end (the bottom of the box body 8) of the segment 1, in the embodiment, two wedge holes 3 are arranged at the upper and lower ends (the top of the cover plate 9 and the bottom of the box body 8) of the segment 1, the wedges are installed in the wedge holes 3 to fix the adjacent shaft segment rings.

[0031] As Figures 3-7 shown, the two ends of the segment 1 (the box body 8) are respectively provided with a tenon structure 4 and a mortise structure 5, the adjacent segments 1 (the box bodies 8) are connected through the cooperation of the tenon structure 4 and the mortise structure 5, the connection part of the adjacent segments 1 (the box bodies 8) is provided with a sealing strip 6, and the tenon structure 4 and the mortise structure 5 are connected by epoxy adhesive. The convex part of the tenon structure 4 and the two sides of the convex part are provided with sealing strips 6, the groove part of the mortise structure 5 and the two sides of the groove part are provided with sealing strips 6, the number and position of the sealing strips 6 on the tenon structure 4 correspond to the number and position of the sealing strips 6 on the mortise structure 5, in the embodiment, one sealing strip 6 is arranged on the convex part of the tenon structure 4 and the two sides of the convex part, and one sealing strip 6 is arranged on the groove part of the mortise structure 5 and the two sides of the groove part, the sealing strip 6 is a rubber sealing strip, which plays a waterproof role and can resist the stress change caused by the thermal expansion and cold contraction of the material.

[0032] As Figures 1-7As shown, the pipe segment 1 is composed of a circular-arc box 7 made of fiber-reinforced composite material (FRP) and modified slag filled in the circular-arc box 7. The FRP material has the advantages of high strength, light weight and corrosion resistance. The modified slag is obtained by modifying a large amount of waste mud generated in the process of slurry balance vertical excavation, i.e., the waste mud is obtained by pre-screening and cyclone screening processes, a slag modifier is added to the sandy particles to enhance their viscosity and strength, and the modified slag is used as the filling material inside the pipe segment 1. Specifically, the filling material inside the pipe segment 1 needs to have certain cohesive force and strength to ensure the stability of the structure, so the slag modifier needs to be added to the flowable sandy particles screened by the cyclone to improve their performance and meet the filling requirements. Common slag modifiers include fly ash, cement, lime, polymer and fiber. The principle is that the slag modifier reacts chemically with the minerals in the soil to produce new substances, such as cementitious substances, which can cement and bond the soil particles together to form a whole with certain strength. At the same time, the slag modifier can fill the pores of the soil, grade the soil particles, solidify the sandy particles and improve the strength of the soil. In addition, the addition of fiber material can have the effect of reinforcement and can also enhance the shear strength of the soil. However, because the mineral composition of the soil in different places is different, the proportion and composition of the slag modifier that needs to be added are also different. Here, only the addition range of the slag modifier is provided as a reference. After mixing and solidification, the unconfined compressive strength of the soil needs to be tested (the strength is greater than 0.5 MPa) to confirm whether the amount of slag modifier added meets the requirements. Here, it is recommended that the mass of fly ash be 12-18% of the mass of the sandy particles, the mass of cement be 4-5% of the mass of the sandy particles, the mass of lime be 3-10% of the mass of the sandy particles, and the mass of water be 10-20% of the mass of the sandy particles.

[0033] The circular-arc box 7 is composed of a box body 8 with an open top and a cover plate 9 for closing the top of the box body 8. The box body 8 and the cover plate 9 are adhered together by epoxy glue. The box body 8 is a monolithic structure and is pre-fabricated by a press film method. The cover plate 9 is pre-fabricated by a mold pressing method. The inner walls of the two circular-arc vertical plates 10 of the box body 7 are each provided with stiffening ribs 11. The stiffening ribs 11 are arranged in the arc direction and the vertical direction of the circular-arc vertical plate 10. The stiffening ribs 11 are used to enhance the strength of the box body 7.

[0034] In addition, during the sinking of the shaft segment, a backwall lubricating material (modified slurry) is needed to lubricate the backwall. The clay particles are separated by a cyclone screen, and the additives are added to reconfigure the modified slurry, so as to meet the strength and fluidity requirements of the backwall grouting. Specifically, the additive for enhancing the backwall lubrication effect can be bentonite or polymer. The amount of bentonite added is related to the grouting process and the type of sand, and the mass of bentonite is 5-20% of the mass of clay particles. The ratio can be confirmed by indoor test before grouting, by simulating the engineering conditions. Then, by installing a friction monitoring device between the shaft wall and the formation, the change of friction during the sinking of the shaft is monitored in real time, so as to determine whether the backwall lubrication effect meets the requirements, and to ensure that the friction around the horizontal ring shaft is uniform, so as to achieve uniform sinking. If a polymer is added, it is additionally needed to consider whether the environmental protection meets the requirements.

[0035] As shown in Figures 8-10 , the shaft support segment structure is installed in the foundation pit, and the backwall cement mortar is poured between the shaft support segment structure and the surrounding rock 12 of the foundation pit. The backwall cement mortar is obtained by mixing the sand particles separated by the cyclone screen with cement mortar. The backwall cement mortar is poured through the backwall grouting pipeline 13, which is installed between the shaft support segment structure and the surrounding rock 12, and the backwall grouting pipeline 13 is arranged along the circumference of the outer wall of the shaft support segment structure. In this embodiment, the backwall grouting pipeline 13 is arranged at the joint 2 of the topmost shaft segment ring.

[0036] In this embodiment, the bottom sealing concrete is formed by mixing the coarse aggregate pre-screened.

[0037] As shown in Figures 1-10 , the embodiment also has the following construction method:

[0038] S1: Segment 1 factory prefabrication stage:

[0039] S1.1: The box 8 is prefabricated by the film pressing method, forming a structure with the lower part closed and the upper part open;

[0040] S1.2: The outside of the box 8 is sandblasted, which is beneficial to form a stronger bonding force after contacting with the backwall cement mortar later;

[0041] S1.3: The cover plate 9 is prefabricated by the mold pressing method.

[0042] S2: Treatment of muck slurry generated during shaft excavation:

[0043] S2.1: Pre-screening of coarse particles to form coarse aggregate;

[0044] S2.2: The sand particles are separated by the first cyclone screen;

[0045] S2.3: Collecting the sandy particles screened by the primary cyclone to a mixing station;

[0046] S2.4: Adding a slag modifier (fly ash, lime, cement, polymer) to the sandy particles and fully stirring them at the mixing station to obtain modified slag with certain viscosity and strength;

[0047] S2.5: Adding an additive (bentonite, polymer) to the clay particles screened by the secondary cyclone to reconfigure modified mud that meets the strength and flow requirements of post-wall grouting;

[0048] S2.6: Circulating the remaining mud after screening and cyclone treatment to the excavation bin through the grout inlet pipeline to achieve green recycling of the mud.

[0049] The coarse aggregate is separated by the pre-screening device, the sandy particles are separated by the primary cyclone, and the clay particles are separated by the secondary cyclone. The coarse aggregate and concrete are mixed to obtain bottom sealing concrete, the sandy particles and slag modifier are mixed to obtain modified slag, the sandy particles and cement mortar are mixed to obtain post-wall cement mortar, and the clay particles and additive are mixed to obtain modified mud.

[0050] S3: Shaft construction phase (taking the excavation of a pit foundation and the construction of a sunk shaft as an example):

[0051] S3.1: Blade foot ring construction:

[0052] S3.1.1: Construction preparation: completing the construction site layout, positioning the equipment embedded parts, confirming the positioning points according to the design drawings, excavating 1-2 m downward, pouring the lock circle beam, and constructing the starting shaft;

[0053] S3.1.2: Installing the blade foot ring: assembling the blade foot ring in the starting shaft;

[0054] S3.1.3: Installing the shaft lifting system: connecting the steel strand and the blade foot ring to make the shaft support segment structure in a controlled state.

[0055] S3.2: Initial ring installation:

[0056] S3.2.1: Applying epoxy glue to the tenon structure 4 and the mortise structure 5 of the box 8;

[0057] S3.2.2: Assembling the box 8 in a ring shape with the opening facing upward and connecting the box 8 to the blade foot ring;

[0058] S3.2.3: Filling the modified slag into the box 8 in batches, and the filling thickness of each batch does not exceed 20 cm;

[0059] S3.2.4: Compacting the modified slag in the box 8 using a vibrating compactor to reduce the porosity of the modified slag in the box 8, so that the modified slag is evenly distributed;

[0060] S3.2.5: Repeating steps S3.2.3 and S3.2.4 until the modified slag in the box 8 fills to the upper surface of the box 8;

[0061] S3.2.6: Applying epoxy glue on the cover plate 9 and covering the box 9 for gluing;

[0062] S3.2.7: Using a ring-shaped cutter to vertically extract the modified slag from the wedge hole 3 of the cover plate 9 to form a hole.

[0063] S3.3: Shaft tunneling preparation:

[0064] S3.3.1: Completing the installation of the main machine fixing seat of the shaft tunneling machine, and hoisting the shaft tunneling machine to the starting shaft;

[0065] S3.3.2: Laying the fixing seat connecting the shaft tunneling machine and the segment 1, and connecting the shaft tunneling machine support arm with the fixing seat;

[0066] S3.3.3: Installing the main machine lifting system, pipeline extension system, and mud circulating system in sequence, and finally connecting the shaft tunneling machine pipeline and completing the debugging.

[0067] S3.4: Standard ring construction:

[0068] S3.4.1: The shaft tunneling machine excavates the soil;

[0069] S3.4.2: Measuring and applying epoxy glue on the cover plate 9 of the previous shaft segment ring;

[0070] S3.4.3: Applying epoxy glue on the bottom of the box 8 of the next shaft segment ring;

[0071] S3.4.4: Misaligning the wedge hole 3 of the box 8 of the next shaft segment ring with the hole in the previous shaft segment ring, and fixing the box 8 of the next shaft segment ring on the previous shaft segment ring, while inserting the wedge into the hole in the previous shaft segment ring for reinforced fixation;

[0072] S3.4.5: Assembling the remaining boxes 8 one by one according to step S3.4.4 until a complete ring is formed;

[0073] S3.4.6: Repeating steps S3.2.3 to S3.2.7 in step S3.2.

[0074] S3.5: Shaft support and sinking:

[0075] S3.5.1: Install vertical and horizontal monitoring instruments on the segment 1 to ensure that the segment does not deviate during the construction of the shaft;

[0076] S3.5.2: If the geological conditions are good, one ring of excavation, one ring of support, and one ring of segment 1 sinking can be used;

[0077] S3.5.3: For soft soil layers prone to settlement, the blade foot ring is first sunk below the working face using a push cylinder to achieve advanced support;

[0078] S3.5.4: During the sinking process, the segment 1 wall is filled with modified mud to reduce the sinking resistance and serve as a mud wall.

[0079] S3.6: Shaft bottom sealing:

[0080] S3.6.1: Remove the shaft boring machine and support;

[0081] S3.6.2: Decide whether to install anti-floating anchor rods at the bottom based on the stress conditions;

[0082] S3.6.3: Use the pre-screened coarse aggregate to mix concrete for underwater bottom sealing concrete pouring;

[0083] S3.6.4: After the bottom sealing is completed, as shown in Figures 8-10 , the back wall grouting pipe 13 is inserted between the surrounding rock 12 and the segment 1, and the back wall cement mortar obtained by mixing the sandy particles screened by the primary cyclone with cement mortar is pumped in. By moving the back wall grouting pipe 13 (see the back wall grouting pipe 13 moving direction a in Figure 10 , the original modified mud is gradually replaced and backfilled with back wall cement mortar from bottom to top. After solidification, the shaft and the surrounding strata form a monolithic stress structure;

[0084] S3.6.5: After the bottom sealing concrete and the back wall cement mortar are completely solidified, the shaft mud is pumped out, and the main shaft construction is completed.

[0085] The beneficial technical effects of the embodiment are:

[0086] (1) The fiber-reinforced composite material (FRP) is used as the material of the support structure, and the segment is directly formed by molding, which has the advantage of simple production, reducing the complex process of traditional reinforced concrete, which requires first binding the steel cage and then pouring the concrete. The material is lightweight, and the segment structure is hollow, which can be transported and constructed using light equipment or manpower, and multiple segments can be transported at a time, improving transportation efficiency and construction speed, and having the advantages of low carbon, high efficiency, reducing labor intensity, saving manpower, and equipment costs. In addition, the mortise and tenon structure avoids the use of curved bolts during assembly, making the segment assembly simpler and more secure;

[0087] (2) Shaft tunneling process of the slurry and the treatment of the muck has been a problem that must be considered in the shaft construction, the muck and slurry generated, whether it is landfill or transportation disposal, may cause road pollution, water pollution, therefore, the slurry and muck are reused, which has certain economic and environmental benefits; the shaft tunneling slurry is pre-screened and formed into coarse aggregate, sandy particles and clay particles by cyclone method, the coarse aggregate can be used in the concrete of shaft bottom sealing, the sandy particles can be used for mixing cement mortar for wall back grouting, the modified sandy particles are used for segment internal filling, and the modified clay particles can be used as drag-reducing slurry in the shaft sinking process.

[0088] Although the above embodiments have been described in detail with reference to the accompanying drawings for the purpose of the conception and embodiments of the present application, those skilled in the art can realize that various improvements and changes can be made to the present application without departing from the scope defined by the claims, therefore, the present application is not limited to the above embodiments, and the above embodiments are not exhaustive.

Claims

1. A vertical shaft support segment structure combining composite material and slag, characterized in that: The vertical shaft support segment structure includes several vertical shaft segment rings, which are assembled circumferentially from several segments. Adjacent vertical shaft segment rings are staggered. Each segment consists of an arc box and modified slag filling the arc box. Wedge holes for installing wedges are provided at both the upper and lower ends of each segment. The number and position of the wedge holes at the upper end of the segment correspond to the number and position of the wedge holes at the lower end of the segment. By installing the wedges in the wedge holes, the adjacent vertical shaft segment rings are fixed together.

2. The composite material-slag combined vertical shaft support segment structure according to claim 1, characterized in that: The two ends of the tube segment are respectively provided with tenon structure and mortise structure. The adjacent tube segments in the circumferential direction are connected by the cooperation of the tenon structure and the mortise structure. A sealing strip is provided at the connection of the adjacent tube segments in the circumferential direction.

3. The composite material-slag combined vertical shaft support segment structure according to claim 2, characterized in that: The tenon structure has a protrusion and both sides of the protrusion provided with the sealing strip, and the mortise structure has a groove and both sides of the groove provided with the sealing strip. The number and position of the sealing strip on the tenon structure correspond to the number and position of the sealing strip on the mortise structure.

4. The composite material-slag combined vertical shaft support segment structure according to claim 2, characterized in that: The arc-shaped box consists of a box body with an opening at the top and a cover plate for closing the top of the box body. The inner walls of the two arc-shaped vertical plates of the box body are provided with stiffening ribs.

5. The composite material-slag combined vertical shaft support segment structure according to claim 4, characterized in that: The vertical shaft segment rings are bonded together with each other, the box body and the cover plate are bonded together with each other with epoxy adhesive.

6. The composite material-slag combined vertical shaft support segment structure according to claim 1, characterized in that: The vertical shaft support segment structure is installed inside the foundation pit, and a wall-mounted cement mortar is poured between the vertical shaft support segment structure and the surrounding rock of the foundation pit.

7. The composite material-slag combined vertical shaft support segment structure according to claim 1, characterized in that: The bottom of the shaft support segment structure is filled with sealing concrete.

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