Pipe piece mold for open caisson model test

Abstract

The utility model belongs to the field of duct piece prefabrication, and particularly relates to a duct piece mold for an open caisson model test, which comprises a mold base, a round mold preformed hole is arranged at the top of the mold base, two semicircular molds which are buckled with each other are arranged on the round mold preformed hole, and connecting plates are respectively arranged at the outer ring end parts of the two semicircular molds. The two semicircular molds are buckled with each other through a connecting plate and are fastened and connected through bolts; a positioner preformed hole is formed in the edge of the mold base, and before the duct piece is poured, the iron wire mesh positioner carries the iron wire mesh to be fixed to the positioner preformed hole, so that the iron wire mesh is fixed in the semicircular mold; the semicircular mold is of a homogeneous circular ring structure or the top of the semicircular mold is of a homogeneous circular ring structure, and the bottom of the semicircular mold is provided with a blade foot structure. According to the utility model, the semicircular mold can be controlled to stably sit on the mold base without sliding, so that the problem of overall stability of the mold is solved; the problem of position fixation during pouring of the wire gauze is solved through the wire gauze positioner.

Description

Technical Field

[0001] The utility model belongs to the field of segment prefabrication, and particularly relates to a segment mold for a caisson model test. Background Art

[0002] With the acceleration of the urbanization process, the demand for infrastructure construction such as subways and underground passages has increased, which has promoted the requirement for high-quality precast segments. Although traditional segment molds have played an important role in the production of precast concrete segments, there are also some disadvantages. There are often insufficient manufacturing precision, complex operation, high maintenance cost, and poor surface finish. Especially, the use of materials such as wood and iron sheets in traditional molds makes the wear resistance and corrosion resistance of the molds poor, resulting in a short service life of the molds and the need for frequent replacement, increasing the production cost. The traditional mold manufacturing process is relatively rough, which easily leads to insufficient mold precision, thus affecting the dimensional accuracy and splicing effect of the segments. The design and manufacturing process of dividing a ring of segments into multiple parts for pouring and then splicing in traditional molds makes the segment model usually require a long production and assembly time, affecting the production efficiency. The splicing position and insufficient mold precision are likely to make the splicing uncertain, increasing the risk and cost.

[0003] Therefore, designing a caisson model test mold with high manufacturing precision, long mold life, simple operation, and high production efficiency is of great significance for improving the test efficiency and precision, reducing costs and risks. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a segment mold for a caisson model test, which can solve the problem of difficult fixation of the position of the steel bars in the segment concrete, realize the precise molding and multiple use of the test segments, with high manufacturing precision, long mold life, high production efficiency, simple operation, and low maintenance cost.

[0005] A segment mold for a caisson model test includes a mold base. A circular mold reserved hole is provided at the top of the mold base. Two mutually buckled semi-circular molds are installed on the circular mold reserved hole. Connecting plates are respectively provided at the outer ring ends of the two semi-circular molds. The two semi-circular molds are mutually buckled through the connecting plates and are tightly connected by bolts. A locator reserved hole is provided at the edge of the mold base. Before pouring the segment, a wire mesh locator with a wire mesh is fixed on the locator reserved hole, so that the wire mesh is fixed inside the semi-circular mold.

[0006] Mold positioning holes are provided on the mold base, and positioning feet are provided on the connecting plates. The positioning feet cooperate with the mold positioning holes to fix the two semi-circular molds on the circular mold reserved hole.

[0007] The semi-circular mold is a homogeneous ring structure to realize the production of homogeneous ring segments.

[0008] The mold base is provided with connecting hole columns, which are arranged between the outer ring and the inner ring of the reserved holes of the circular mold. During pouring, the segments at the positions of the connecting hole columns form holes, and the holes at the positions of these segments are assembled with the holes at the positions of other segments through steel columns, preventing shaking and dislocation between the spliced segments during the sinking process of the caisson model test.

[0009] The top of the semi-circular mold is a homogeneous circular ring structure, and the bottom is provided with a cutting edge structure. The outer side of the cutting edge structure protrudes from the outer ring of the homogeneous circular ring structure, the inner top is connected to the inner ring of the homogeneous circular ring structure, and the inner bottom inclines towards the outer ring side of the homogeneous circular ring structure to realize the production of segments with cutting edges.

[0010] The reserved holes of the circular mold match the shapes of the cutting edge structures of the two semi-circular molds.

[0011] The inner ring wall of the semi-circular mold is provided with segment settlement connection holes.

[0012] The semi-circular mold is provided with grouting holes, and the distance between the two grouting holes is 120°; the semi-circular mold is provided with 1 measuring line hole, and the measuring line hole is arranged between the two grouting holes.

[0013] The wire mesh locator includes a circular ring-shaped fixing seat. The inner ring edge of the circular ring-shaped fixing seat is provided with a plurality of wire mesh positioning holes for fixing the wire mesh, and the outer ring edge of the circular ring-shaped fixing seat is provided with wire mesh positioning feet, and the wire mesh positioning feet are inserted into the reserved holes of the locator on the mold base to realize the fixation of the wire mesh in the semi-circular mold.

[0014] The material of the semi-circular mold is steel.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. By setting reserved holes of the circular mold on the mold base, the present utility model can control the stable placement of the semi-circular mold on the mold base without sliding, thereby solving the problem of the overall stability of the mold; by using the wire mesh locator, the problem of the fixed position of the wire mesh during pouring is solved; at the same time, measuring line holes and grouting holes can be reserved to solve problems such as measuring line connection and grouting of buried components.

[0017] 2. The mold of the present utility model can realize the production of homogeneous circular ring segments and the production of segments with cutting edges, and the mold for producing segments with cutting edges can reserve wire holes for segment settlement, thereby solving the problem of controlling the stable sinking of segments.

[0018] 3. The utility model solves the problem of preventing slurry leakage from the mold by setting semicircular mold reserved holes and connecting plates on the outer ring ends of the semicircular molds respectively, and fastening the connecting plates of the two semicircular molds by bolts to enhance the tightness of the mold. The mold of the utility model makes the production of test segment models fast and simple, has a long service life and can be reused, accurately positions steel bars and connecting wires, is convenient for demoulding, improves production efficiency, and reduces costs and risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the mold base of the homogeneous circular ring mold in the segment mold;

[0020] Figure 2 It is a schematic structural diagram of the semicircular mold of the homogeneous circular ring mold in the segment mold;

[0021] Figure 2 (a) It is a schematic structural diagram of one half of the semicircular mold of the homogeneous circular ring mold in the segment mold;

[0022] Figure 2 (b) It is a schematic structural diagram of the other half of the semicircular mold of the homogeneous circular ring mold in the segment mold;

[0023] Figure 3 It is a schematic structural diagram of the mold base of the mold with blade feet in the segment mold;

[0024] Figure 4 It is a schematic structural diagram of the semicircular mold of the mold with blade feet in the segment mold;

[0025] Figure 4 (a) It is a schematic structural diagram of one half of the semicircular mold of the mold with blade feet in the segment mold;

[0026] Figure 4 (b) It is a schematic structural diagram of the other half of the semicircular mold of the mold with blade feet in the segment mold;

[0027] Figure 5 It is a schematic structural diagram of the wire mesh locator in the segment mold;

[0028] In the drawings: 1. Mold base; 101. Mold positioning hole; 2. Circular mold reserved hole; 3. Semicircular mold; 4. Connecting plate; 401. Positioning foot; 5. Locator reserved hole; 6. Wire mesh locator; 601. Ring-shaped fixing seat; 602. Wire mesh positioning hole; 603. Wire mesh positioning foot; 7. Connecting hole column; 8. Homogeneous circular ring structure; 9. Blade foot structure; 10. Segment settlement connecting hole; 11. Grouting hole; 12. Measuring line hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present utility model will be described in detail below with reference to the accompanying drawings.

[0030] As shown Figures 1-5 in the figure, a segment mold for a caisson model test. On the top of the mold base 1, there is a circular mold reserved hole 2. Two mutually buckled semi-circular molds 3 are installed on the circular mold reserved hole 2. Connecting plates 4 are respectively arranged at the outer ring ends of the two semi-circular molds 3. The two semi-circular molds 3 are buckled with each other through the connecting plates 4 and are tightly connected by bolts; a locator reserved hole 5 is arranged at the edge of the mold base 1. Before pouring the segment, the wire mesh locator 6 carries the wire mesh and is fixed on the locator reserved hole 5. The wire mesh locator 6 is fixed on the locator reserved hole 5, so that the wire mesh is fixed in the semi-circular mold 3. The wire mesh locator 6 can adjust the position and height of the wire mesh in the semi-circular mold 3. In this embodiment, the diameter of the locator reserved hole 5 is 1 cm. A mold positioning hole 101 is arranged on the mold base 1, and a positioning foot 401 is arranged on the connecting plate 4. The positioning foot 401 cooperates with the mold positioning hole 101 to stably fix the two semi-circular molds 3 on the circular mold reserved hole 2.

[0031] A grouting hole 11 is arranged on the semi-circular mold 3. The distance between the two grouting holes 11 is 120°. In this embodiment, one of the semi-circular molds 3 is provided with 2 grouting holes 11 with a diameter of 0.4 cm, and the other semi-circular mold 3 is provided with 1 grouting hole 11 with a diameter of 0.4 cm. Before pouring, a steel wire is inserted into the grouting hole 11, and the steel wire is pulled out after pouring is completed, so that a grouting hole 11 is formed on the segment, which facilitates pouring concrete into the soil during the caisson model test.

[0032] A measuring line hole 12 with a diameter of 0.6 cm is arranged on the semi-circular mold 3. The measuring line hole 12 is arranged between the two grouting holes 11. Before pouring, a steel wire is inserted into the measuring line hole 12, and the steel wire is pulled out after pouring is completed, so that a measuring line hole 12 is formed on the segment for the measuring line of the earth pressure cell to pass through the segment.

[0033] The wire mesh locator 6 includes an annular fixing seat 601. Four wire mesh positioning holes 602 for fixing the wire mesh are arranged at the inner ring edge of the annular fixing seat 601. A wire mesh positioning foot 603 is arranged at the outer ring edge of the annular fixing seat 601. The wire mesh positioning foot 603 is inserted into the locator reserved hole 5 of the mold base 1 to realize the fixing of the wire mesh in the semi-circular mold 3. In this embodiment, the wire mesh positioning foot 603 is 20.4 cm long and the depth inserted into the locator reserved hole 5 is 0.4 cm.

[0034] The material of the semi-circular mold 3 is steel, and the thickness of the steel is 4 mm.

[0035] Concrete casting molds are devices used to form and fix the shape of concrete during the concrete construction process. Molds are widely used in construction, bridges, roads, and other infrastructure projects. The key points of concrete casting molds include:

[0036] On the one hand, materials: Common mold materials include wood, steel, aluminum, and plastic. Wooden molds are low-cost but have poor durability; steel molds are durable but heavy and are suitable for large-scale and repeated use; aluminum molds are lightweight and easy to handle; plastic molds are suitable for casting specific shapes and are convenient to use.

[0037] On the other hand, types:

[0038] Fixed molds: For single-use, mainly used in simple and small-scale projects.

[0039] Reusable molds: Suitable for large-scale or repeated construction projects and can be used multiple times.

[0040] Detachable molds: Can be disassembled after the concrete hardens and are suitable for complex shapes and large-scale construction.

[0041] When designing the mold, it is necessary to consider the pouring pressure of the concrete, the stability of the mold, and its easy disassembly. During the design, it is also necessary to consider the heat and shrinkage that may occur during the hardening process of the concrete; the installation of the mold needs to ensure its stability to prevent the mold from moving during the concrete pouring process. After pouring, the mold can be removed only after the concrete has reached sufficient strength to prevent damage to the concrete structure; therefore, due to the need to ensure the high precision and reusability of the test, steel is used as the mold material for the test.

[0042] Example 1

[0043] The semi-circular mold 3 is a homogeneous circular ring structure 8 to realize the production of homogeneous circular segment linings.

[0044] In this embodiment, the outer radius of the outer ring of the reserved hole 2 of the circular mold is 10.4 cm, the inner radius of the outer ring is 10 cm, the depth is 2 cm, and the height is 10 cm; the outer radius of the inner ring is 8.5 cm, the inner radius of the inner ring is 8.1 cm, the depth is 2 cm, and the height is 10 cm.

[0045] The mold base 1 is provided with connecting hole columns 7, which are arranged between the outer ring and the inner ring of the circular mold reserved hole 2. During pouring, the segments at the positions of the connecting hole columns 7 form holes, and the holes at the positions of these segments are assembled with steel columns at the holes of other segments to prevent shaking and dislocation between the spliced segments during the sinking process of the caisson model test. In this embodiment, 3 connecting hole columns 7 with a diameter of 0.3 cm and a height of 1.5 cm are welded on the circular mold reserved hole 2, and the interval between two connecting hole columns 7 is 120°. When pouring concrete to the upper surface, insert the 3 connecting hole columns evenly into the mold at the same position perpendicular to the base until they just sink into the concrete surface, then the longitudinal connecting holes of the segments can be made.

[0046] A method for making homogeneous circular ring segments using two semi-circular molds of a homogeneous circular ring structure, comprising the following steps:

[0047] Step 1: Prepare concrete according to test requirements, and strictly control the mix ratio and mixing time;

[0048] Step 2: First, place the mold base 1 horizontally on a plane; apply an oil-based release agent inside the two semi-circular molds 3 and then place them in the mold base 1. The positioning feet 401 on the connecting plates 4 of the two semi-circular molds are embedded in the mold positioning holes 101. After the two semi-circular molds 3 are placed, fix the two semi-circular molds 3 with 6 bolts and nuts of M3*10.

[0049] Step 3: Hook the prefabricated wire mesh with four small iron hooks tied with nylon ropes with a diameter of 2 mm at the top; place the wire mesh locator 6 in the mold base 1, and embed the wire mesh positioning feet 603 into the reserved holes 5 of the locator for fixation; pass the nylon rope through the wire mesh positioning holes 602 of the wire mesh locator 6 to fix the wire mesh in the correct position.

[0050] Step 4: Insert the steel wires forming the grouting holes 11 and the measuring line holes 12 into the semi-circular molds 3 respectively, pour concrete into the molds until the concrete covers 2 / 3 of the position of the wire mesh. During the pouring process, ensure uniform distribution, and use a vibrating table or a vibrating rod to vibrate and compact to eliminate air bubbles. After pouring is completed, take out the steel wires, small iron hooks, nylon ropes, and the wire mesh locator 6.

[0051] Step 5: After the segments are cured for a certain period of time, disassemble the mold, and the test segments are made; since the semi-circular molds 3 are provided with connecting hole columns 7, corresponding holes are left at the corresponding positions at the bottom of the made test segments; repeat the above steps to complete the production of multiple segments.

[0052] Example 2

[0053] The top of the semi-circular mold 3 is a homogeneous circular ring structure 8, and the bottom is provided with a cutting edge structure 9. The outer side of the cutting edge structure 9 protrudes beyond the outer ring of the homogeneous circular ring structure 8. The inner top is connected to the inner ring of the homogeneous circular ring structure 8, and the inner bottom inclines towards the outer ring side of the homogeneous circular ring structure 8. The reserved hole 2 of the circular mold matches the shape of the cutting edge structures 9 of the two semi-circular molds 3. In this embodiment, the outer radius of the outer hole of the circular mold reserved hole 2 is 10.8 cm, the inner radius of the outer hole is 10.4 cm, the depth is 2 cm, and the height is 10 cm; the outer radius of the inner hole is 10 cm, the inner radius of the inner hole is 9.6 cm, the depth is 2 cm, and the height is 10 cm.

[0054] In this embodiment, for medium and small caissons, the length that the outer side of the cutting edge structure 9 protrudes beyond the outer ring of the homogeneous circular ring structure 8 is usually 150 mm to 300 mm; for large caissons, the length that the outer side of the cutting edge structure 9 protrudes beyond the outer ring of the homogeneous circular ring structure 8 is usually 300 mm to 500 mm; for extra-large caissons, under certain special conditions, the length that the outer side of the cutting edge structure 9 protrudes beyond the outer ring of the homogeneous circular ring structure 8 may exceed 500 mm;

[0055] Under soft soil conditions, the inclination of the inner bottom towards the outer ring side of the homogeneous circular ring structure is usually between 1:1.5 and 1:2; this inclination design can increase the soil cutting effect and help the caisson sink more easily; under hard soil conditions, the inclination of the inner bottom towards the outer ring side of the homogeneous circular ring structure is usually between 1:2.5 and 1:3.

[0056] The inner ring wall of the semi-circular mold 3 is provided with segment settlement connection holes 10. In this embodiment, there are 2 segment settlement connection holes 10 on one semi-circular mold 3, and the distance between the two segment settlement connection holes 10 is 120 degrees. There is 1 segment settlement connection hole 10 on the other semi-circular mold 3. Before pouring, insert steel wires into these holes. After pouring, when conducting the caisson test, the segments are sunk into the soil through the steel wires in these holes.

[0057] A method for manufacturing a segment with a cutting edge using two semi-circular molds with cutting edge structures includes the following steps:

[0058] Step 1: Prepare the concrete according to the test requirements, and strictly control the mix ratio and mixing time;

[0059] Step 2: First, place the mold base 1 horizontally on a plane; coat the inside of the two semi-circular molds 3 with an oil-based release agent. First, press the wire mesh tightly against the inner ring wall of the semi-circular mold 3 and make the steel wires for controlling settlement welded in the wire mesh pass through the segment settlement connection holes 10 on the inner ring wall, and then put the wire mesh and the steel wires into the mold base 1 together. At this time, use four small iron hooks tied with nylon ropes to hook the wire mesh, and then put the outer ring mold in. The positioning feet 401 on the two semi-circular mold connecting plates 4 are embedded in the mold positioning holes 101, and then fix the two semi-circular molds 3 with 6 bolts and nuts of M3*10;

[0060] Step 4: Place the wire mesh locator 6 in the mold base 1, insert the wire mesh positioning feet 603 of the wire mesh locator into the reserved holes 5 of the locator, pass the nylon rope through the wire mesh positioning holes 602 of the wire mesh locator 6 for positioning the wire mesh, and fix the wire mesh in the correct position;

[0061] Step 5: Insert the steel wires for forming the grouting holes 11 and the measuring wire holes 12 respectively on the semi-circular mold 3, pour concrete into the mold until the concrete covers 2 / 3 of the position of the wire mesh. During the pouring process, ensure uniform distribution, and use a vibrating table or a vibrating rod to vibrate and compact to eliminate air bubbles. Remove the small iron hooks, nylon ropes, and the segment wire mesh locator 6. When pouring to the top surface, place 3 steel columns, and after pouring is completed, remove the steel columns to form holes corresponding to the holes at the top of the homogeneous circular segment. Specifically, drill three holes at the position corresponding to the holes of the homogeneous circular segment above the wire mesh locator 6, and tie the steel columns with ropes and let them drop vertically, then holes corresponding to the holes at the top of the homogeneous circular segment can be poured out;

[0062] Step 7: After the segment is cured for a certain period of time, disassemble the mold, and the segment with a cutting edge is manufactured;

[0063] Example 3

[0064] When conducting the settlement test, the segment with a cutting edge first sinks into the soil body. Then, insert steel columns at the holes at the top of the segment with a cutting edge. Then, place the holes at the bottom of the homogeneous circular segment corresponding to the positions of the steel columns above the segment with a cutting edge, and so on to complete the installation of all segments. During the sequential installation of the segments, control the sinking of the segments by connecting the steel wires on the settlement connection holes of the segments with ropes. At the same time, grout into the soil body through the grouting holes, and a soil pressure gauge can be connected outside the measuring wire holes to measure the soil pressure.

Claims

1. A segment mold for caisson model test, characterized in that: It includes a mold base, a circular mold reserved hole is provided on the top of the mold base, two semicircular molds that are interlocked with each other are installed on the circular mold reserved hole, and the outer ring ends of the two semicircular molds are respectively provided with connecting plates. The two semicircular molds are interlocked with each other through the connecting plates and are fastened together by bolts; a locator reserved hole is provided at the edge of the mold base, and before casting the pipe segment, the wire mesh locator carries the wire mesh and is fixed on the locator reserved hole to fix the wire mesh in the semicircular mold.

2. A segment mold for caisson model testing according to claim 1, characterized in that: The mold base is provided with a mold positioning hole, and the connecting plate is provided with a positioning foot, which cooperates with the mold positioning hole to fix the two semicircular molds on the reserved hole of the circular mold.

3. The segment mold for caisson model test according to claim 1, characterized in that: The wire mesh locator includes a circular ring-shaped fixing seat, the inner ring edge of the circular ring-shaped fixing seat is provided with a plurality of wire mesh locating holes for fixing the wire mesh, the outer ring edge of the circular ring-shaped fixing seat is provided with wire mesh locating feet, the wire mesh locating feet are inserted into the locator reserved holes of the mold base to fix the wire mesh in the semicircular mold.

4. The segment mold for caisson model test according to claim 1, characterized in that: The semicircular mold is a homogeneous circular ring structure.

5. The segment mold for caisson model test according to claim 3, characterized in that: The mold base is provided with a connecting hole column, and the connecting hole column is arranged between the outer ring and the inner ring of the reserved hole of the circular mold.

6. The segment mold for caisson model test according to claim 1, characterized in that: The top of the semicircular mold is a homogeneous circular ring structure, and the bottom has a blade foot structure. The outer side of the blade foot structure protrudes from the outer ring of the homogeneous circular ring structure, the inner top is connected to the inner ring of the homogeneous circular ring structure, and the inner bottom is inclined toward the outer ring side of the homogeneous circular ring structure, thereby realizing the production of pipe segments with blade feet.

7. The segment mold for caisson model test according to claim 5, characterized in that: The reserved holes of the circular mold match the structural shapes of the blade feet of the two semicircular molds.

8. The segment mold for caisson model test according to claim 5, characterized in that: The inner ring wall of the semicircular mold is provided with a pipe segment settlement connection hole.

9. A segment mold for caisson model testing according to any one of claims 1 to 8, characterized in that: The semicircular mold is provided with grouting holes, and the spacing between the two grouting holes is 120 degrees; the semicircular mold is provided with a line measuring hole, and the line measuring hole is arranged between the two grouting holes.

10. A segment mold for caisson model testing according to claim 9, characterized in that: The material of the semicircular mold is steel.

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